单项选择题

（）is the population of China

A. How much
B. How many
C. Which
D. What

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单项选择题
In case of poisoning, immediately give large quantities of soapy or salty water in order to （）vomitting.

A. control
B. clean
C. induce
D. stop
单项选择题
Not until the early years of the 19th century（）what heat is.

A. man did know
B. man know
C. didn't man know
D. did man know
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