20. Free radicals of oxygen, which common by-products of metabolic processes in the body, are capable of causing tissue damage. 答案是A,为什么呀?怎么改A呢? -------------- 25. Visibly only through large telescopes, Pluto has a yellowish color, which indicates that there is very little atmosphere.
答案是A,我也选了A,但是如果要改正它,应该怎么改呢?
谢谢!
答案是A,为什么呀?怎么改A呢? -------------- 25. Visibly only through large telescopes, Pluto has a yellowish color, which indicates that there is very little atmosphere.
答案是A,我也选了A,但是如果要改正它,应该怎么改呢?
谢谢!
[此贴子已经被作者于2006-8-3 2:56:12编辑过] |