1.这必将有益于我们的个人健康，也有益于地球的健康。

　　This will _____ _____ _____ our personal health as well as for the health of the planet.

　　2.在危难时他是个可以信赖的人。

　　He is a man who can _____ _____ _____ in a crisis.

　　3.因为堵车，昨天他们开会迟到了。

　　They _____ _____ _____ the meeting because of the heavy traffic yesterday.

　　4.即使我们在工作中取得了很大的成绩， 也不应该自满。

　　_____ _____ we achieve great success in our work, we should not be conceited.

　　5.世界各地随时都有这种情况发生。

　　It happens all the time __________ _____ _____.

　　6.俱乐部的几个会员举行了一个小型聚会。

　　Several members of the club _____ _____ for a small party.

　　7.我从3倒数到0，你们能看到它们几乎同时抵达底部。

　　I will _____ _____ three to zero, and then you can see that they reach the bottom almost at the same time.

　　8.你应该一步一个脚印的进步。

　　You should _____ _____________ step by step.

　 Eye doctors in Shanghai found out that the nearsightedness among primary and middle school students has something to do with the colour of the paper in their textbooks and notebooks．

　 The doctors suggested that yellow paper will be used to replace the white one．According to

their research，the experts found out white paper reflects too much light and easily tires a person’s eyes．The yellow paper，however，doesn’t look so sharp to a person’s eyes．In other words，it is much milder to the eyes of students who may do reading or writing for hours．

The experts’research findings were based on first．hand information and a number of scientific experiments including a new study among the students from forty-one middle schools．To make the students understand the truth，Shanghai Education Development Co．Ltd．has produced textbooks and exercise．books made of yellow paper．The books will be used in the whole city soon．

(　 )49．What does the word“replace”here mean in Chinese?

　　　 A．放置　　　　 　B．重置　　　　 C．替代　　　　 D．发生

(　 )50．The doctors found out_________ caused the students’nearsightedness．

　　　 A．their studies have　　　　　　　　 B．the colour of the paper has

　　　 C．the textbooks and notebooks have　　 D．the colour of their clothes has

(　 )51．Why does white paper easily make our eyes tired?

　　　 A．Because white paper reflects too much light．

　　　 B．Because white paper gets in too much light．

　　　 C．Because white paper is always shining．

D．Because white paper is too bright．