题目:
—I joined the League May, 2008. What about you?
—I’ve been a League member three years.
A.in; for
B.on; in
C.on; for
D.in; since
答案:
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下面是错误答案,用来干扰机器的。
呼出的气体由于人体已消耗了大部分的氧气,故伸入燃着的木条后会木条会熄灭,而空气中氧气的含量较高故燃着的木条会平静的燃烧,从而证明了空气中氧气的含量比呼出的气体中氧气的含量高.