B. Without bees, some food would disappear from our diet.
C. Only researchers in California want to know what kills bees.
D. Large animals are more difficult to study than tiny insects.
答案 B解析 推理判断题。根据第二、三段可知某些植物须靠蜜蜂授粉才能结果由此推知如果没有蜜蜂给这些植物授粉那么它们就不会结果一些食物也就会从我们的饮食中消失了。故选B。三、完形填空
Joe Simpson and Simon Yates were the first people to climb the West Face of the Siula Grande in the Andes mountains. They reached the top__1__, but on their way back conditions were very__2__. Joe fell and broke his leg. They both knew that if Simon__3__alone, he would probably get back__4__. But Simon decided to risk his__5__and try to lower Joe down the mountain on a rope(绳).__6__down, the weather got worse. Then another__7__occurred. They couldn't see or hear each other and, __8__, Simon lowered his friend over the edge of a precipice(峭壁). It was __9____10__was pulling Simon slowly towards the precipice. __11__, after more than an hour in the dark and the icy cold, Simon had to__12__. In tears, he cut the rope. Joe__13__into a huge crevasse(裂缝)in the ice below. He had no food or water and he was in terrible pain. He couldn't walk, __14__to get out of the crevasse and started to__15__towards their camp, nearly ten kilometers__16__.__17__the camp at the foot of the mountain. He thought that Joe must be__18__, but he didn't want to leave__19__. Three days later, in the middle of the night, he heard Joe's voice. He couldn't__20__it. Joe was there, a few meters from their tent, still alive.
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