It takes ________half an hour _________ his homework every day.
A:he; do
B:he; to do
C:him; to do
D:him; doing
甲、乙两台编织机同时编织一种毛衣,在5天中,两台编织机每天出的合格品数量如下(单位:件):
甲:10,8,7,7,8;
乙:9,8,7,7,9.
在这5天中,哪台编织机出合格品的波动较小?