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【单选题】
下列哪种维生素缺乏可引起牙龈出血、伤口愈合慢?( )A.
维生素A
B.
维生素C
C.
维生素K
D.
维生素B1
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举一反三
【单选题】When William hurried home, he found that his mother ____already ____to hospital.
A.
has; been sent
B.
had; sent
C.
has; sent
D.
had; been sent
【单选题】He has many works of William Shakespeare, but only one is ______.
A.
initial
B.
elementary
C.
original
D.
primary
【单选题】In this area open-mining has ______ the natural scenery.
A.
ruined
B.
created
C.
added
D.
developed
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