下列消毒剂中属于气体灭菌剂的是()。
A.甲醛
B.环氧乙烷
C.过氧乙酸
D.过氧化氢
E.戊二醛
参考答案:B
人靠_________听声音,人感知声音的基本过程是:外界传来的声音引起_________振动,这种振动经过__________________传给听觉神经,听觉神经把信号传给_________,这样人就听到了声音.
The boy insisted that he old enough, and the right to make his own choice.
A.was; be given
B.was; was given
C.be; give
D.is; given