皮皮学，免费搜题
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【单选题】
下列盐中，难溶于水的是：A.
Ca（HCO 3 ） 2
B.
CaCO 3
C.
Na 2 CO 3
D.
（NH 4 ） 2 CO
E.
NH 4 Cl
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举一反三
【单选题】He was in hospital for six months. He felt as if he were ______ from the outside world. [ ]
A.
cut down
B.
cut off
C.
cut in
D.
cut through
【单选题】The old factory has been ____to make way for a supermarket. [ ]
A.
cut down
B.
broken down
C.
torn down
D.
calmed down
【简答题】《营造法式》、《清式营造则例》、《工部工程做法》三本书分别成书于（ ）。
【简答题】Father Christmas is at risk of serious illness because of his bulging waistline and needs to cut down on the mince pies, doctors warned. A survey of shopping centre Santas in Scotland revealed an aver...
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