停产大修的特点是（）。
A.时间紧、任务重
B.时间宽松、任务重
C.时间宽松、任务轻
D.时间紧、任务轻
参考答案：A
The library needs ______, but it will have to wait until Sunday.
A．cleaning
B．be cleaned
C．clean
D．being cleaned
hGH的基本功能有________和________。
