来源：文都四级系列图书  作者：郭崇兴

31.The supermarket sells various kinds of things, （从衣物食品到电脑游戏）.

32.The new type of machine has been put in service, （让我们年底完成工程成为可能）.

33. It is true that humans have an extraordinary genius for working wonders, but （污染仍是当前及未来最严重的问题之一）.

34. It is true that the world faces problems of pollution, but （这个问题可以通过全球的努力加以控制）.

35.（在任何一个存在种族歧视的社会里）, there will always be tension.

36.Some people say that in the next 30 years the population of Antarctica will grow steadily, （印度也同样）