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本专栏提供的三道“四里选一”的选择题,都要求口答,如若动笔,则应自省基本功不过硬了。 1 条件甲为A∪CB∪C,条件乙为AB。则甲为乙的( )条件。 (A)充分不必要。(B)必要不充分。 (C)充分且必要。(D)不充分且不必要。 2 曲线y=(x+1)1986/1985上有三点:
The three-choice “choosing one of the four-in-one” multiple-choice questions in this column all require an answer. If you do, you should be self-examination. 1 Condition A is A∪CB∪C, condition B is AB. Then A is B’s () condition. (A) Adequately unnecessary. (B) Not enough. (C) Adequate and necessary. (D) Insufficient and unnecessary. 2 There are three points on the curve y=(x+1)1986/1985: