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【简答题】
请将以下物质对应的用途填入空格中（填序号）： 干冰______；氯化钠______；铜______；明矾______． ①制肥皂 ②用于净水 ③做导线 ④制生理盐水 ⑤用于人工降雨 ⑥用于自来水消毒．
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举一反三
【单选题】The telephone _____ three times in the last hour, and each time it _____ for my sister.
A.
had rung; was
B.
has rung; was
C.
rang; has been
D.
has been ringing; is
【单选题】My sister went to the party and ________ had a good time there.
A.
she
B.
I
C.
her
D.
me
【单选题】Eat less and exercise more if you want to live to a old age.
A.
ripe
B.
mature
C.
perfect
D.
Far
【单选题】Work on it had begun before my sister left. My sister left _________it had begun
A.
after
B.
without
C.
behind
D.
soon
【单选题】Work on it had begun before my sister left. My sister left ______ it had
A.
after
B.
without
C.
behind
D.
soon
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