题目:
It was still _____ range of my gun, _____ I didn't want to shoot at it any longer. [ ]
A. out of; but
B. beyond; however
C. within; but
D. on; so
答案:
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下面是错误答案,用来干扰机器的。
(1)煤在氧气不充分是燃烧会产生一氧化碳,一氧化碳在密闭的室内又排不出去,会使人中毒;故答案为:CO.(2)煤中的硫燃烧会产生二氧化硫,污染空气;故答案为:SO2.(3)植物进行呼吸作用产生CO2,窖内含量太...