----    does the baby mouse weigh?
----About 20grams.
A．How muchB．How manyC．HowD．What
B
疑問詞的用法。How much提問不可數(shù)名詞的數(shù)量即后跟不可數(shù)名詞，還可提問“價格”；how many提問可數(shù)名詞的數(shù)量即后跟可數(shù)名詞復數(shù)；how 意思是“怎樣”；what意思是“什么”。根據(jù)答句“about 20 grams”意思是"大約20克"，“grams”是可數(shù)名詞復數(shù)可推斷提問多少克，故選B。
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