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【单选题】
下列关于蔗糖的说法中，不正确的是（ ）A.
蔗糖是最重要的双糖，它的相对分子质量是葡萄糖的两倍
B.
纯净的蔗糖溶液中加入银氨溶液，微热，不发生反应
C.
向蔗糖与稀硫酸共热后的溶液中滴加银氨溶液，再水浴加热，看不到生成
D.
在蔗糖里加入浓硫酸，可观察到颜色变黑，并有气泡出现
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A.
keep in touch with
B.
keep pace with
C.
keep away from
D.
keep down with
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A.
I would help
B.
It would taste
C.
we lived
D.
we would live
E.
I were
F.
it weren't
G.
I wouldn't wait; I would go
H.
you didn't go; you wouldn't be
I.
there wasn't; there wouldn't be
J.
would you; you didn't have
【简答题】( ) Everyone is friendly and I enjoy my job.
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