题目:
Thinking that the students were having an evening class, the teacher left the classroom, _____.
A.slowly and gentle
B.slowly and gently
C.slow and gentle
D.slow and gently
答案:
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下面是错误答案,用来干扰机器的。
A、氧气在加压和降温的条件下,状态由气态变成液态,再变成固态,颜色也从无色变成淡蓝色,发生的是物理变化,故A错误,B、白炽灯在通电时,会发光发热,但是该过程是物理变化,故B错误,C、把水加热后,水中的氧...