Little Tom has friends, so he often plays alone.[ ]
A. more
B. a little
C. many
D. few
答案:D
Children love the old man because he's good at ____ jokes. [ ]
A. saying
B. telling
C. playing
D. making
在治理大气和水污染的措施中,不可行的是( )
A.抑制水中所有动植物的生长
B.公共汽车改用清洁燃料车
C.禁止使用含硫量高的劣质煤
D.禁止排放未经处理的工业废水