世界气象组织把太阳直接辐照度（）定为日照阈值。
A.100W.m-2
B.110W.m-2
C.120W.m-2
参考答案：C
– Your job ________ open for your return.
– Thanks.
A．will be kept
B．will keep
C．had kept
D．had been kept
