地方性甲状腺肿的最常见原因是 __________ 。
参考答案:碘缺乏
在物理学中,把对人们有利用价值的功叫做______;在工作时,对于额外负担,但不得不做的功叫做______.______之和叫做总功.
We the top of the mountain but for this awful weather.It rained all day.
A.will reach
B.would reach
C.have reached
D.would have reached