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【单选题】
()最早使词由伶工歌词转向士大夫之词。A.
B.
主
C.
D.
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反馈参考答案：
举一反三
【单选题】已知f(x)在[a,b]上连续,(a,b)内可导,且当x∈(a,b)时,有 又已知f(a)>0.则( )
A.
f(x)在[a,b]上单调增加,且f(b)>0
B.
f(x)在[a,b]上单调减少,且f(b)<0
C.
f(x)在[a,b]上单调增加,且f(b)<0
D.
f(x)在[a,b]上单调减少,但f(b)正负号无法确定
【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
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