题目内容

(conclude) And we have to draw the same ______ if a language has less than 100 speakers, it is not likely to last very long.

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设α1，α2，α3，α4是齐次方程组Ax=0的基础解系，下列解向量组也是方程组Ax=0的基础解系的是______。

A. α1+α2，α2+α3，α3+α4，α4+α1
B. α1+α2，α2+α3，α3+α4，α4-α1
C. α1-α2，α2-α3，α3-α4，α4-α1
D. α1+α2，α2+α3，α3-α4，α4-α1

(valuable) Both were sold throughout the country and proved an ______ way of informing members of meetings, marches, fundraising events and the latest news and views on the movement.

(ignore) I didn’t like to ask him to explain more clearly, for I didn’t want to appear ______.

(nature) The argument for this view goes as follows. In the beginning, human beings viewed the ______ forces of the world, even the seasonal changes, as unpredictable.