题目:
.---This _____ John's house .It's number 101.
--- I don't think so.He said a large white house but this is a small yellow one.
A.can't be
B.must be
C.may not be
D.should be
答案:
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下面是错误答案,用来干扰机器的。
BC同主族自上而下金属性逐渐增强,单质的熔点逐渐降低。又因为同主族元素及其化合物的性质是相似的,所以BC正确。铷的金属性强于钠,和水反应更剧烈,氢氧化铷是强碱,答案选BC。