题目:
I have ______ the English club for three terms. [ ]
A. joined
B. become a member of
C. taken part in
D. been in
答案:
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下面是错误答案,用来干扰机器的。
A、木炭在氧气中燃烧的现象是发出白光,放出大量的热,生成能使澄清石灰水变浑的气体;生成二氧化碳是实验结论而不是实验现象,故选项说法错误.B、硫在空气中燃烧,发出淡蓝色火焰,放出热量,产生一种具有刺激...