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----    does the baby mouse weigh?
----About 20grams.
A.How muchB.How manyC.HowD.What
B
疑问词的用法。How much提问不可数名词的数量即后跟不可数名词,还可提问“价格”;how many提问可数名词的数量即后跟可数名词复数;how 意思是“怎样”;what意思是“什么”。根据答句“about 20 grams”意思是"大约20克",“grams”是可数名词复数可推断提问多少克,故选B。
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