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10．As the air is being polluted，many kinds of wild animals are________. A．died B．dying down C．dying out D．death 解析： die为不及物动词，不能用被动语态，排除A项；death为名词“死亡”，不合题意。根据题意应为“灭绝”。 答案： C come into being形成；产生 教材原句P30：They lived on the earth tens of millions of years ago，long before humans came into being and their future seemed secure at that time.它们生活在亿万年前的地球上，比人类诞生早很多，而且那时它们的未来看似很安全。 ①When did the club first come into being? 俱乐部是什么时候成立的？ ②The new tax regulations came into effect last month. 新税法是上个月生效的。 ③The present government came into power a year ago. 本届政府一年前开始执政的。 ④As you went on，a lake came into sight. 你向前走，一个湖就出现在了眼前。 come into effect生效 come into sight看得见 come into office就职 come into power当权；执政 come into use开始使用 11.(北京高考)Scientists have many theories about how the universe________into being. A．came B．was coming C．had comeD．would come 解析： 句意为：关于宇宙是如何产生的，科学家们有很多理论。根据句意可知宇宙产生绝非将来要发生的事，所以先排除B、D两项，C项had come为过去的过去，因题中无过去时间作参照，故排除。宇宙产生发生在过去，故用一般过去时。 答案： A in danger在危险中，垂危 教材原句P25：Why are they in danger of disappearing? 它们为什么处于灭绝的危险中？ ①We were warned that we were in danger. 有人警告我们有危险。 ②Another famous animal in danger is the giant panda，whose habitat is in China.另一种著名的濒临灭绝的动物是大熊猫，它们的栖息地在中国。 | 
