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哥本哈根世界气候大会全称《联合国气候变化框架公约》第15次缔约方会议暨《京都议定书》第5次缔约方会议，于2009年12月7－18日在丹麦首都哥本哈根召开。来自192个国家的谈判代表召开峰会，商讨《京都议定书》一期承诺到期后的后续方案，即2012年至2020年的全球CO 2 减排协议。下图1为碳循环示意图，图2为食物网。请据图回答： 碳从无机环境进入生物群落的途径①是（）作用；无机环境中碳的来源有（）（填数字序号）。
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【单选题】G8 Summit Leaders of the Group of Eight Major Industrialized Nations ( G8 ) will meet in Scotland in July this year. Representatives from China, India, Mexico, South Africa and Brazil have also been i...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】下面关于生物群落结构的叙述不正确的是 [ ]
A.
在垂直方向上，群落具有明显的分层现象
B.
动物在群落中垂直分布依赖于植物
C.
在动物群落中没有水平结构
D.
在水平方向上，不同地段的生物种类分布也有差异
【单选题】Section B Directions: There are 2 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You shou...
A.
It may not prove an environmental crisis at all.
B.
It is an issue requiring world wide commitments.
C.
Serious steps have been taken to avoid or stop it.
D.
Very little will be done to bring it under control.
相关题目：
【单选题】G8 Summit Leaders of the Group of Eight Major Industrialized Nations ( G8 ) will meet in Scotland in July this year. Representatives from China, India, Mexico, South Africa and Brazil have also been i...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】下面关于生物群落结构的叙述不正确的是 [ ]
A.
在垂直方向上，群落具有明显的分层现象
B.
动物在群落中垂直分布依赖于植物
C.
在动物群落中没有水平结构
D.
在水平方向上，不同地段的生物种类分布也有差异
【单选题】Section B Directions: There are 2 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You shou...
A.
It may not prove an environmental crisis at all.
B.
It is an issue requiring world wide commitments.
C.
Serious steps have been taken to avoid or stop it.
D.
Very little will be done to bring it under control.
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