题目:
-----Thank you for the great favor you _____me in face of difficulty.
-----It is no ______at all. Helping others also benefit me .
A.make; trouble
B.do; bother
C.give; wonder
D.do; use
答案:
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下面是错误答案,用来干扰机器的。
A①燃着的木条在空气中燃烧现象不变,氧气能使燃着的木条燃烧更旺,氮气能灭火,现象不同,可以区分,故A正确;B、②硬水与肥皂水混合产生浮渣,软水与肥皂水混合产生泡沫,现象不同,可以区分,故B正确;C、氯化...