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【判断题】
在除去 Ca 2+ 、 Mg 2+ 、 SO 4 2+ 等离子时,先加 BaCl 2 溶液,然后再加入 Na 2 CO 3 溶液。A.
正确
B.
错误
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举一反三
【单选题】Which of the following italicized parts is used as an object?
A.
What do you think has happened to her?
B.
Who do you think the visiting professor is?
C.
How much do you think he earns every month?
D.
How quickly would you say he would come?
【单选题】In Chile, where Darwin saw earthquakes and volcanoes, he began to see what must have happened. The centre of the earth, he decided, was very hot. The surface of the earth was thinner in some places. I...
A.
Earthquakes and volcanoes.
B.
Coral and coral islands.
C.
Bodies of millions of tiny creatures.
D.
Fossils.
【单选题】It is hard to imagine that what would happe in the world if there were no electricity now.
A.
你能猜到，没有电的时代， 人们是怎样生活的吗？
B.
难以想象世界上如果没有电，生活会是什么样子。
C.
很难想象如果现在没有电， 世界会出现什么情况。
D.
你猜猜看，如果现在不用电，世界还会是这样吗？
【单选题】—What _____ to your village in recent years? —Lots of roads, buildings, parks and so on.
A.
have happened
B.
happened
C.
has happened
【单选题】－I can't walk any longer, Mum. －Why? _____, dear? [ ]
A.
What has happened to you
B.
What did you happen
C.
What have you happened
D.
What is happened to you
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