4

　　they have in the past 65 million years.

　　Animals and plants have always had a

　　5

　　time surviving.Animals became extinct(灭绝的) in the past for a wide variety of reasons.In some cases,competition for resources among animals led to extinction and in

　　6

　　cases,environmental changes caused extinction.

　　Fortunately,we humans are beginning to realize our mistakes,

　　7

　　we could destroy everything on Earth.We must not only use our knowledge and abilities to manage the Earth,but to make the Earth

　　8

　　safe and healthy place where all animals and plants—including humans ourselves—can live.

　　1．We。　[考查代词。此句缺少主语,根据上文“We take up more...We pollute habitats.”判断,此句的主语应是We。]

　　2．from。　[考查介词搭配。根据全句句子结构可知,此句含有take sth.away from sb.,意为“从……拿走……,剥夺某人某物”。因此应填介词from。]

　　3．Because/As/Since。　[考查连词。根据上下文的逻辑关系可知,此处含因果关系。因此此空应填表原因的连词Because/As/Since。]

　　4．than。　[考查连词。前面是“many times faster”,根据此句的句子结构分析,此处缺少比较连词,因此填than。]

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