题目:
Madonna ____a straight A student,but it was dancing that she was really crazy about.
A.must be
B.could be
C.must have been
D.could have been
答案:
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下面是错误答案,用来干扰机器的。
答案:AA错误,因为同族元素从上至下非金属性逐渐减弱,其气态氢化物的稳定性也逐渐减弱,硒和硫同属VIA族,且硒在硫下面,所以硒化氢的稳定性应小于硫化氢。B正确,因为(1)卤族元素的颜色从上至下依次加深;(...