A.nothing B.neither

C.no one D.none

答案　D　[句意：当涉及全球能源革命时，没有一种能源比在(中国的)南海海下开采的可燃冰更有潜力。根据句意可知，此处表示"没有一种能源"，故只能用none"没有一种，没有一个"。]

5.-Which movie do you like better，Zootopia or The BFG?

-________.There are good things and bad things about them.

A.It's hard to say B.I didn't get it

C.You must be kidding D.Couldn't be better

答案　A　["你更喜欢哪部电影，《疯狂动物城》还是《圆梦巨人》""很难说。它们各有优缺点。"从答语中的"它们各有优缺点"可知，空格处应是It's hard to say "很难说"，故答案为A项。I didn't get it "我不明白"；You must be kidding "你一定在开玩笑"；Couldn't be better "没有比这更好的了"。]

6.It's said that he is focusing on a book on space exploration.But ________ it will come out is still up in the air.

A.what B.why

C.how D.when

答案　D　[句意：据说他正在写一本关于太空探索的书，但这本书何时出版还未确定。根据句意及句子结构可知，应用when在句中引导主语从句，且在从句中作时间状语，表示"在......时候"。]

7.She was going to start a new life as a freshman.But her story came to a(n) ________ end as she died of a heart attack after losing her tuition fees.

C.abstract D.casual

答案　B　[句意：她打算以大学一年级新生的身份开始新的生活。但是，她的故事却以不幸而告终，因为她在丢失学费后，突发心脏病而死。complex "复杂的"