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【简答题】
何谓酶的必需基团?必需基团的分类及其作用分别有哪些?
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【单选题】I was just going to cut my rose bushes but someone _____ it. Was it you? [ ]
A.
has done
B.
had done
C.
would do
D.
will do
【单选题】I was just going to water my garden but someone _____ it. Was it Tom? [ ]
A.
has done
B.
had done
C.
would do
D.
was doing
【简答题】Most of the work was done by my sister and me B. I C. my D. Mine
【单选题】一圆形线圈，它的一半处于均匀磁场中，另一半位于磁场之外，如图所示。磁感应强度B的方向垂直地指向纸面内。欲使圆线圈中感应出顺时针方向的电流，则( )【图片】
A.
线圈应沿X 轴正向平动
B.
线圈应沿Y 轴正向平动
C.
线圈应沿Y 轴负向平动
D.
线圈应沿X 轴负向平动
【单选题】The experiment, ________ will soon be announced~ was done by my colleagues.
A.
whose results
B.
the results on which
C.
at which the results
D.
of whose results
【单选题】My parents died young, but I have done well in this respect ________ my other ancestors.
A.
to
B.
for
C.
as regards
D.
with
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