单项选择题

If you concentrate all your efforts on the study of English, you will surely master the language well.

A. 如果把全部精力都集中在英语学习上，你就肯定会掌握好这种语言。
B. 要是你用全部时间学习英语，那将只能学好一种语言。
C. 假如你把所有精力都用来学习英语，就将能学会这种语言。
D. 如果你化了一切力量来学英语，学好这种语言是没问题的。
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单项选择题
Why are some scientists interested in studying aging problem
A. They want to increase the general ability of our bodies.
B. They may be able to find a better way of our life.
C. If they can pin down the biochemical process that makes us age, there will be hope for extending the length of life.
D. They want to find out if there is a link between how efficiently a cell could repair itself and how long a creature lives.
单项选择题
In the last four paragraphs, the writer seems to suggest that one should ______.
A. not be honest on the net
B. be careful about the online friends
C. make friends with those you trust
D. believe nobody on the net
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