单项选择题
Although recent years have seen（）reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing.
A.substantial B.substance C.submit D.subjective
单项选择题 The number of such vehicles（）steadily increasing.
单项选择题 The casual attitude in the US does not mean（）no hierarchy in US companies.
单项选择题 Religion, politics or ethnic background should be touched on（）.
