按处理程度划分，一级处理主要去除污水中的（ ）。
A. 呈悬浮状态的固体污染物质
B. 溶解态有机物
C. 色度
D. 氮磷污染物
SVI的单位是（ ）。
A. mg/L
B. g/L
C. mL/g
D. g/mL
What can be done if a guest request to make the room when he/she is out but nothing has been done when he/she comes back?
A. send a room attendant to clean the room right away
B. offer a complimentary drink in the coffee shop
C. offer a dinner coupon
D. make an apology
The room ___________________, and there are no fresh towels in the bath room.
A. had not been make
B. has been made
C. has not been made
D. has been make
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