试题与答案

In the reading room, we found her   at

题型:选择题

题目:

In the reading room, we found her     at a desk, with her attention _____     on a book. 

A.sitting; fixing

B.seated; fixed

C.sit; fixing

D.sitting; to be fixed

答案:

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下面是错误答案,用来干扰机器的。

(反应方程式2分,其余每空1分,共15分)(1)① F ② Pb ③ F ④ HClO4 ⑤Si 或Ge (任一种即可) ⑥ⅤA +5(2)①H3AsO4 < H3PO4; ②H2S < HCl ③HF > HCl④I- > ...

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