— How's your tour around the North Lake? Is it beautiful?

— It _____ be, but it is now heavily polluted. [ ]

A. will

B. would

C. should

D. must

以下称量过程，不正确的操作是（）。

A.为称量方便，打开天平的前门；

B.用软毛刷轻轻扫净秤盘；

C.热物品冷却至室温后再称量；

D.称量完毕切断电源。