does the baby mouse weigh?-- About 20 grams.A. HowB. WhatC. How many gramsD. How he

问题补充：

--- does the baby mouse weigh? ---- About 20 grams.

A. How

B. What

C. How many grams

D. How heavily

答案：

A. How

B. What

(答案→)C. How many grams

D. How heavily

解析：句意：这只幼鼠有多重？大约20克。How 如何，问的是方式方法；what什么；指代事物；C 多少克，D的表述不正确，可以表述为How heavy is the baby mouse? 结合语境故选C。