Man is now facing a big problem-______________, which is becoming more and more serious. First, ______________ second, ______________.
14、现在，越来越多的人开始意识到________的严重性
Nowadays more and more people are beginning to be aware of the seriousness of ______________.
15、最近几年人们基本意识到_________
It is only during the last years that man has become generally aware that ______________.
16、有一个旧的说法________-，它是我们父辈的经验，然而，今天在许多事情上，它仍是
正确的
There is an old saying, ______________. It's the experience of our forefathers, however, it is correct in many cases ever today.
17、英国谚语_______，这是非常正确的，因为_________
The English proverb says, ______________. This is quite true because ________.
18、_____是______,同时又是_____,这两个因素已经引起______,我们应该做些什么解决________面对目前的环境
______________ is now______________, and at the same time______________.These two factors have caused ______________. Then what shall we do to solve ______________ in the face of such a situation.
19、一位远古的哲人说过，________,中国人已经铭记于心
One of our ancient philosophers said, ______________. Chinese people have always been holding this idea to be one of their standards of morality.
20、一位非常著名的作家说过______,如果这是真的，目前的状况应使我们沉思______
One of the great early writers said that ______________. If this is true, the present situation should make us ponder over ______________.
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