呼吸性粉尘是指能被吸入人体呼吸系统的悬浮粉尘。
参考答案:错
The story is about an old Indian farmer and an American tourist in India,__ understanding the other’s language.
A.none of whom
B.both of them
C.neither of them
D.neither of whom
良好的餐厅服务和优质的()都是客人需要的,所以它们应该互为补充,相辅相成。
A.餐厅气氛
B.卫生状况
C.美味佳肴
D.菜肴价格