5.下列命题中,真命题是 ( )
A、 B、
C、 D、
4.已知向量a,b均为单位向量,若它们的夹角60°,则|a-3b|等于 ( )
A. B. C. D.4
3.已知条件p: k=,条件q:直线y=kx+2与圆x2+y2=1相切,则p是q的 ( )
A.充分不必要条件 B.必要不充分条件
C.充分必要条件 D.既不充分也不必要条件
2.已知,则下列不等式一定成立的是( )
A、 B、 C、 D、
1.复数等于 ( )
A. B. C. D.
2.将5个句子组织成连贯的一篇短文,使用必要的连接词。
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[答案]
Marks Do Not Mean Everything
It is usual that many students' parents and teachers consider marks as everything, but in fact, marks only show whether one gains more or less achievement in a certain period. It does not mean students who get high marks are top or excellent ones. What's more, marks can be truly improved if you work hard at your lessons. However bad you feel at present, you'll find happiness in the future, so you should adjust your mind to reality and make up your mind to make progress. As a matter of fact, if you put your heart into your study, whatever the result is, there is nothing left for you to regret.
1.必须使用5个句子介绍全部所给的内容。
4.只要自己付出了,就没有什么可后悔的。
(写作要求)
3.要学会调整心态,争取进步;
2.成绩是可以通过自身的努力提高的;
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