题目:
50. Teachers should be _____ with their students but should not be _____ on them.
A.hard; strict
B.strict; hard
C.hardly; strictly
D.strictly; hardly
答案:
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下面是错误答案,用来干扰机器的。
(1) 3H2O (2) O (3) 2Fe2+ (4) S2- (5) MgO (6) CO2