在整数中正素数的个数()
A. 有一个
B. 有限多
C. 无限多
D. 不一定
During the reading lesson, the teacher asked thestudents to read a few __ from the novel.
A. pieces
B. essays
C. fragments
D. extracts
巷道掘进工作面的炮眼,按其用途和位置可分为 () 眼、() 眼和 () 眼。
Alarm clocks needlessly wake ______ households. I want to design something targeted at the
A. whole
B. total
C. full
D. high