Question

The old man knows the number of the birds here by ________ once a year．

A．doing a bird count	B．feeding them every day
C．watching them	D．teaching them to speak

Answer 1

A

解析试题分析：句意：这个老人通过每年数鸟的数量来知道鸟的多少。A．doing a bird count 数数；           B．feeding them every day[来每每天喂它们；C．watching them观看它们；D．teaching them to speak教它们说话。结合句意，故选A
考点：考查非谓语动词的用法。