参考答案：A 应改为To。[解析] to the best of my knowledge据我所知，例如：To the best of my knowledge，he is honest and reliable．也可用to my knowledge，如：I am not sure，but to my knowledge his story is true．
One should not talk about unpleasant subjects
for
a social gathering.
Also
,we should avoid any subject that
might
hurt the feelings of the people you are
with
.
A. for B. Also C. might D. with
The helicopter excels
for
military missions,
carrying
troops, guns and strategic instruments
where
other
aircraft
cannot go.
A. for B. carrying C. where D. aircraft
参考答案：A 应改为in。[解析] excel in(=do better than others，be very good)优于...
The price of
any
particular product or service is linked to a broad,complicated system of
priceswhich
everything seems to depend more or less upon
everything else
.
A. any B. prices C. which D. everything else
There is
a
general understanding
in
the members of the Board of Directors that chief attention
be given
to the undertaking that is expected to
bring in
the highest profit.
A. a B. in C. be given D. bring in
参考答案：B 应改为among。[解析] among the members of在……的成员之中。understanding是具...
An important factor in
a
market-oriented economy is the mechanism
by
which
consumer
demands can be expressed and
responded
by producers.
A. a B. by C. consumer D. responded
参考答案：D 应改为responded to。[解析] respond to(=act in answer to)回答，对……作出...
If two theories are equal
to
their ability to account
for
a body of data, the theory that
does so
with the smaller number of assumptions is
to be preferred
.
A. to B. for C. does so D. to be preferred
参考答案：A 应改为in。[解析] be equal to...与……相等；be equal in...在……方面相等。译文：假如...
Having been
robbed
off
economic importance, those states are
not
likely to count for
very much
in international political terms.
A. Having been B. off C. not D. very much
参考答案：B 应改为of。[解析] rob sb. of sth．，抢夺某人某物。(not)count for much没有重要性...
