施工单位应当在工程竣工验收前，将形成的有关工程档案向（）归档。
A.监理单位
B.建设单位
C.城建档案管理机构
D.质量监督机构
参考答案：B
It is believed that a new kind of drug ______ by the scientists and they are hopeful that they
will succeed in a couple of months. [ ]
A. has been developed
B. is being developed
C. is developing
D. has developed
在所有旅游收入中储蓄量及用于进口和其他对外支付的数量越大，乘数效应也就越（）。
