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【单选题】
钙剂和磷酸盐应分别在不同的溶液中稀释，主要原因在于（）
A.
二者混合后可能升高溶液pH值
B.
二者混合后可能降低溶液pH值
C.
二者混合后可能产生磷酸钙沉淀
D.
钙剂在磷酸盐溶液中不稳定
E.
磷酸盐增大了钙剂的解离度
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参考答案：
举一反三
【单选题】韩愈的《陆浑山火》一文,被后人称为难解,其主要原因在于()。
A.
意义丰富,可多角度理解而各执一词
B.
境界迷离,语词多义而难
C.
文字艰深,典故冷僻而难
D.
无从考据的历史语境
【单选题】与100mL0.5mol/LNaCl溶液所含的Cl-物质的量浓度相同的是（ ）
A.
100mL0.5mol/LMgCl2溶液
B.
200mL0.25mol/LAlCl3溶液
C.
50mL 0.5mol/LKCl溶液
D.
25mL0.5mol/LFeCl3溶液
【单选题】下列溶液中的Cl - 浓度与50mL1mol/L的AlCl 3 溶液中的Cl - 浓度相等的是（ ）
A.
150ml1mol/L的NaCl溶液
B.
50ml3mol/L的NaCl溶液
C.
150ml3mol/L的MgCl 2 溶液
D.
75ml2mol/L的KCl溶液
【单选题】下列关于0.1 mol·L-1硝酸钾溶液的叙述中，正确的是( )
A.
1 L该溶液中含有硝酸钾101 g
B.
100 mL该溶液中含有硝酸钾0.01 mol
C.
从1 L该溶液中取出500 mL后，剩余溶液的浓度为0.05 mol·L-1
D.
1 L水中溶解0.1 mol硝酸钾,即可配得0.1 mol·L-1硝酸钾溶液
【单选题】Organic FoodOrganic farming was among the fastest growing segments of U.S. agriculture during the 1990s. The value of retail. sales of organic food was estimated to be $16 billion in 2004. According t...
A.
As you can imagine, organic agricultural practices are quite distinct from those of "conventional" fanning.
B.
Organic farmers:
C.
feed soil and build soil matter with natural fertilizer to grow their crops use insect predators, mating disruption, traps and barriers to protect crops from pests and disease make use of crop rotation, mechanical tillage and hand-weeding, as well as cover crops, mulches, flame weeding and other management methods to control weed growth.As a last resort, organic farmers may apply certain botanical or other non-synthetic pesticides. Conventional farmers:,
D.
apply chemical fertilizers to the soil to grow their crops spray with insecticides to protect crops from pests and disease use synthetic herbicides to control weed growth.
E.
How Do I Know if a Food is Organic
F.
Look for the word "organic" on vegetables or pieces of fruit, or on the sign above the organic produce display. The word "organic" may also appear on packages of meat, cartons of milk or eggs, cheese and other single-ingredient foods. Foods labeled "100 percent organic" must contain only organic ingredients. Products containing at least 70 percent organic content can be labeled "made with organic ingredients". Those foods labeled simply "organic" must have at least 95 percent organic ingredients, by weight or fluid volume, excluding water and salt. Anyone who knowingly sells or labels a product "organic" that is not produced and handled in accordance with these regulations can face a civil penalty of up to $10,000.
G.
Foods grown and processed according to the federal standards will in most cases bear the seal "USDA Organic". As its use is voluntary, companies may choose not to display the seal.
H.
Why Should I Care if a Food is Organic According to the USDA, organic food production allows farmers to lower input costs, decrease reliance on nonrenewable resources, capture high-value markets and premium prices, and boost farm income. Organic agriculture also has many important environmental, benefits:
I.
It promotes sustainability by establishing an ecological balance to prevent soil fertility or pest problems. In the long run, organic farms tend to conserve energy and protect the environment by maintaining ecological harmony.
J.
It enhances biodiversity, or the presence of multiple plant and animal species. Having a highly diverse genetic pool becomes useful in the future when beneficial characteristics can be tapped.
.
Because organic agriculture utilizes practices such as crop rotations, inter-cropping, symbiotic associations, cover crops and minimum tillage, the length of time that the soil is exposed to erosive forces is decreased, which minimizes nutrient losses and boosts soil productivity. By not using synthetic fertilizers and pesticides, organic agriculture-reduces pollution of groundwater.
K.
Organic agriculture helps to minimize the greenhouse effect and global warming through its ability to keep carbon in the soil.
L.
Why is Organic Food So Expensive
M.
Prices tend to be higher for organic titan conventional products. As stated on the Web site of the Food and Agriculture Organization (FAO) of the United Nations (UN), certified organic products are generally, more expensive than their conventional counterparts because:
N.
The organic food supply is limited as compared to demand. Production costs for organic foods are typically higher because of greater labor input and because farmers don’t produce enough of a single product to lower the overall cost.
.
Post-harvest handling of relatively small quantities of organic foods results in higher costs because organic and conventional 0roduce must be separated for processing and transportation.
.
Marketing and the distribution chain for organic products are relatively inefficient, and costs are higher because of relatively small volumes.
.
The FAO also notes that as the demand for organic food and products increases, technological innovations and economies of scale should reduce costs of production, processing, distribution and marketing for organic produce.
.
Is Organic Food Better than Conventional Food
.
Organic and conventional food must meet the same quality and safety standards. Organic food differs from conventionally produced food simply in the way it is grown, handled, and processed. There is no scientific evidence to suggest that it is more nutritious or safer than conventional food. A recently published report indicates that organic food is less likely to contain pesticide residues than conventional food. Yet, according to the National Research Council, the traces of pesticides left on conventionally grown products are unlikely to cause an increased cancer risk. Also, if fruits and vegetables are properly washed, most of the chemicals can be removed. As for taste, that’s up to you to decide what you like best. In general, people tend to find that the fresher a food is, the better it tastes, regardless of how it was produced.
【多选题】社会主义发展道路多样性的原因在于（）
A.
各国生产力发展状况差异性
B.
各国社会发展阶段的差异性
C.
各国历史文化传统的差异性
D.
各国生活习惯的差异性
E.
时代和实践的不断发展
相关题目：
【单选题】韩愈的《陆浑山火》一文,被后人称为难解,其主要原因在于()。
A.
意义丰富,可多角度理解而各执一词
B.
境界迷离,语词多义而难
C.
文字艰深,典故冷僻而难
D.
无从考据的历史语境
【单选题】与100mL0.5mol/LNaCl溶液所含的Cl-物质的量浓度相同的是（ ）
A.
100mL0.5mol/LMgCl2溶液
B.
200mL0.25mol/LAlCl3溶液
C.
50mL 0.5mol/LKCl溶液
D.
25mL0.5mol/LFeCl3溶液
【单选题】下列溶液中的Cl - 浓度与50mL1mol/L的AlCl 3 溶液中的Cl - 浓度相等的是（ ）
A.
150ml1mol/L的NaCl溶液
B.
50ml3mol/L的NaCl溶液
C.
150ml3mol/L的MgCl 2 溶液
D.
75ml2mol/L的KCl溶液
【单选题】下列关于0.1 mol·L-1硝酸钾溶液的叙述中，正确的是( )
A.
1 L该溶液中含有硝酸钾101 g
B.
100 mL该溶液中含有硝酸钾0.01 mol
C.
从1 L该溶液中取出500 mL后，剩余溶液的浓度为0.05 mol·L-1
D.
1 L水中溶解0.1 mol硝酸钾,即可配得0.1 mol·L-1硝酸钾溶液
【单选题】Organic FoodOrganic farming was among the fastest growing segments of U.S. agriculture during the 1990s. The value of retail. sales of organic food was estimated to be $16 billion in 2004. According t...
A.
As you can imagine, organic agricultural practices are quite distinct from those of "conventional" fanning.
B.
Organic farmers:
C.
feed soil and build soil matter with natural fertilizer to grow their crops use insect predators, mating disruption, traps and barriers to protect crops from pests and disease make use of crop rotation, mechanical tillage and hand-weeding, as well as cover crops, mulches, flame weeding and other management methods to control weed growth.As a last resort, organic farmers may apply certain botanical or other non-synthetic pesticides. Conventional farmers:,
D.
apply chemical fertilizers to the soil to grow their crops spray with insecticides to protect crops from pests and disease use synthetic herbicides to control weed growth.
E.
How Do I Know if a Food is Organic
F.
Look for the word "organic" on vegetables or pieces of fruit, or on the sign above the organic produce display. The word "organic" may also appear on packages of meat, cartons of milk or eggs, cheese and other single-ingredient foods. Foods labeled "100 percent organic" must contain only organic ingredients. Products containing at least 70 percent organic content can be labeled "made with organic ingredients". Those foods labeled simply "organic" must have at least 95 percent organic ingredients, by weight or fluid volume, excluding water and salt. Anyone who knowingly sells or labels a product "organic" that is not produced and handled in accordance with these regulations can face a civil penalty of up to $10,000.
G.
Foods grown and processed according to the federal standards will in most cases bear the seal "USDA Organic". As its use is voluntary, companies may choose not to display the seal.
H.
Why Should I Care if a Food is Organic According to the USDA, organic food production allows farmers to lower input costs, decrease reliance on nonrenewable resources, capture high-value markets and premium prices, and boost farm income. Organic agriculture also has many important environmental, benefits:
I.
It promotes sustainability by establishing an ecological balance to prevent soil fertility or pest problems. In the long run, organic farms tend to conserve energy and protect the environment by maintaining ecological harmony.
J.
It enhances biodiversity, or the presence of multiple plant and animal species. Having a highly diverse genetic pool becomes useful in the future when beneficial characteristics can be tapped.
.
Because organic agriculture utilizes practices such as crop rotations, inter-cropping, symbiotic associations, cover crops and minimum tillage, the length of time that the soil is exposed to erosive forces is decreased, which minimizes nutrient losses and boosts soil productivity. By not using synthetic fertilizers and pesticides, organic agriculture-reduces pollution of groundwater.
K.
Organic agriculture helps to minimize the greenhouse effect and global warming through its ability to keep carbon in the soil.
L.
Why is Organic Food So Expensive
M.
Prices tend to be higher for organic titan conventional products. As stated on the Web site of the Food and Agriculture Organization (FAO) of the United Nations (UN), certified organic products are generally, more expensive than their conventional counterparts because:
N.
The organic food supply is limited as compared to demand. Production costs for organic foods are typically higher because of greater labor input and because farmers don’t produce enough of a single product to lower the overall cost.
.
Post-harvest handling of relatively small quantities of organic foods results in higher costs because organic and conventional 0roduce must be separated for processing and transportation.
.
Marketing and the distribution chain for organic products are relatively inefficient, and costs are higher because of relatively small volumes.
.
The FAO also notes that as the demand for organic food and products increases, technological innovations and economies of scale should reduce costs of production, processing, distribution and marketing for organic produce.
.
Is Organic Food Better than Conventional Food
.
Organic and conventional food must meet the same quality and safety standards. Organic food differs from conventionally produced food simply in the way it is grown, handled, and processed. There is no scientific evidence to suggest that it is more nutritious or safer than conventional food. A recently published report indicates that organic food is less likely to contain pesticide residues than conventional food. Yet, according to the National Research Council, the traces of pesticides left on conventionally grown products are unlikely to cause an increased cancer risk. Also, if fruits and vegetables are properly washed, most of the chemicals can be removed. As for taste, that’s up to you to decide what you like best. In general, people tend to find that the fresher a food is, the better it tastes, regardless of how it was produced.
【多选题】社会主义发展道路多样性的原因在于（）
A.
各国生产力发展状况差异性
B.
各国社会发展阶段的差异性
C.
各国历史文化传统的差异性
D.
各国生活习惯的差异性
E.
时代和实践的不断发展
参考解析：
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