时间定额以（）为单位。
A．“工日”
B．“台班”
C．“天”
D．川、时
参考答案：A
We are now enjoying the cool air in the room. ____, the farmers are harvesting crops in the hot sun.
A．Therefore
B．Besides
C．As a result
D．In the meantime
中学生每天应睡足10小时才能消除疲劳，还能预防近视。
