According to the passage, which of the following statements is right
A reader should find some mistakes when he is reading.
B. The mere difficult a book is, the more you can get from it.
C. To mad something is easier than to watch something.
D. One should be in the same track with the writer when he is reading.
______, he can quickly find out what's wrong with the machine.
A) Having been well trained
B) Having well trained
C) To be well trained
D) To have been well trained
It's high time we ______ something to stop road accidents.
A) did
B) are doing
C) will do
D) do
某医生调查得知10名女中学生体重X (kg)与肺活量Y(L)，经直线回归分析可知，b＝0.0748，若tb＞t0.05,8，按α＝0.05水准，可认为( )
A. 肺活量与体重大小无关
B. 肺活量随体重增加而增加
C. 体重与肺活量间无线性相关关系存在
D. 体重与肺活量间有函数关系存在
E. 体重与肺活量均值差别有统计学意义
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