Besides calling 911, here is what to do in some life-threatening emergencies when no one is around to help. Lost in the wilderness First, you’ve got to acknowledge you're in trouble. Stay where you can be seen, clearly and remember to rest. Keeping a sense of humor helps too -- it reduces strum and helps creative thinking. In a wide open area, make a colorful cress out of rocks to show your present position. Choking Aim to hit the top of the chair against your stomach, in the soft part below the bony upside-down V of the ribs (肋骨). Make a sudden push against the chair. If you still can’t breathe after six tries, call 911, even if you can’t talk. Write the word “choking” somewhere nearby, and leave the line open until help arrives. Severe bleeding Use your hand or clean cotton, or paper towels, or a scarf, or any cloth you can find, and push down on the wound until the bleeding stops. But if you put a band around your leg tightly, you’re going to close the vessels (血管) to the entire leg. In this way, you could loose foot. Bear attack If yon surprise a bear, don't run away. That invites an attack. Instead, stand up and back away slowly, without looking the bear in the eyes. If it does charge (猛冲) at you, stick out your chest, raise your arms, and spread your legs. Shout at the bear, to frighten it. If it's going to attack, lie facedown, with your hands held firmly behind your neck. Play dead until you're sure the bear is gone. 1. When you see a colorful cross made of rocks in the wilderness, you know ______. A. someone is bleeding                  B. someone is choking C. someone is lost                      D. someone is attacked by a bear 2. If you are still choking after six tries, you should ______. A. keep a sense of humor                 B. call 911 and leave the line open C. use your hand our clean cotton         D. lie down with your hands behind your neck 3. Don't tie around your bleeding leg tightly, or you could ______. A. stop bleeding  B. reduce stress   C. loose your foot      D. cause breathlessness 4. The passage is mainly teaching us how to ______. A. survive the emergencies                      B. avoid a bear attack. C. deal with a choke                         D. find our way