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【简答题】
物质的组成、分类及表示是学习化学的基础 （1）地壳内含量最多的金属元素是______；人体内含量最多的元素是______；水中含有的+1价的元素符号是______． （2）如图所示表示气体分子示意模型，其中属于化合物的是______（填字母，下同），属于混合物的是______，选用（1）中的元素，表示A图中的分子，其化学式可能为______（写两种）．
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【单选题】—What school _____ do you think should be changed? —I think we should be allowed to wear our own clothes. [ ]
A.
rules
B.
subjects
C.
classes
D.
sports
【单选题】Let’s visit the bookstore on our way back home, ？
A.
shan’t we
B.
won’t you
C.
shall we
D.
will you
【单选题】On our way home, our bikes______, so we had to walk home.
A.
is broken
B.
was broke
C.
broke down
D.
breaks down
【单选题】On the way home our bus and we can't go any farther. [ ]
A.
broke
B.
broke up
C.
broke down
D.
broke into
【单选题】How I wish that the engine______ down on our way back home last night.
A.
didn't break
B.
would not break
C.
hadn't broken
D.
shouldn't break
【单选题】Let's visit. the bookstore in our way back home,______?
A.
shan't we
B.
won't you
C.
shall we
D.
will you
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