调查问卷一般由（）等部分构成。
A.开头
B.提纲
C.正文
D.结尾
参考答案：A, C, D
下列是某种雄性动物精巢内正在分裂的四个细胞示意图，其中属于次级精母细胞的是：[ ]
A．
B．
C．
D．
His efforts to raise money for his program were ______ because, no one showed any intention to take a cent out of their pockets.
A．in place
B．in sight
C．in effect
D．in vain
