How (could) you make (such) a little child (to help) you (carry) the big box
A. could
B. such
C. to help
D. carry
清洁与消毒的区别是,前者是清除( )的有害物,后者是清除( )的有害物。
A. 可见,不可见
B. 不可见,可见
Each term our professors would______a list of books for us to read
A. hand in
B. give away
C. pass out
D. write out
餐饮业洗手液的余氯浓度一般应控制在()ppm左右。
A. 30
B. 50
C. 80