答案　C

　　解析　短语辨析题。A. 寻找；B. 代替；C. 因缺乏；D. 生怕，以免。句子的完整意思应该是：大城市建起越来越多的高楼大厦，因为缺乏空间。

　　7．Some insects ________ the colour of their surroundings to protect themselves.

　　A．take in B．take off C．take on D．take out

　　答案　C

　　解析　考查短语动词的辨析。take in吸收，欺骗；take off拿走，取下，脱去(衣服等)，起飞；take on承担，呈现，雇用；take out把......带出去，清除，除掉。句意为"一些昆虫为了保护自己，让自己的体色与其周围环境的颜色相似。"

　　8．She has a gift for creating an atmosphere for her students ________ allows them to communicate freely with each other.

　　A．which B．where C．what D．who

　　答案　A

　　解析　考查定语从句。分析句子成分可知，an atmosphere与修饰它的定语从句被for her students隔开，该从句缺少主语，所以用which。

　　9．-It's said that it will be extremely cold this winter.

　　-________，the majority of the experts predict that the temperature will be normal.

A．In other words B．On the contrary