198.
Canadian
scientists have calculated that one human being should be struck every nine
years by a meteorite, while each year sixteen buildings can be expected to
sustain damage from such objects.
(A) one human
being should be struck every nine years by a meteorite
(B) a human being
should be struck by a meteorite once in every nine years
(C) a meteorite
will strike one human being once in every nine years
(D)
every nine years a human being will be struck by a meteorite（D）
(E) every nine
years a human being should be struck by a meteorite 为什么不能用should be呢在这里？？
123.
As a result of
the ground-breaking work of Barbara McClintock, many scientists now believe
that all of the information encoded in 50,000 to 100,000 of the different
genes found in a human cell are contained in merely three percent of the
cell’s DNA.
(A) 50,000 to 100,000
of the different genes found in a human cell are contained in merely
(B) 50,000 to 100,000
of the human cell’s different genes are contained in a mere
(C) the 50,000 to 100,000
different genes found in human cells are contained in merely
(D) 50,000 to 100,000
of human cell’s different genes is contained in merely（E）
(E)
the 50,000 to 100,000 different genes found in a human cell is contained in a mere 请问E项为什么要用is呢，其主语是all of the information吗？如是，其应用做单数吗？
118.
Art museums do
not usually think of their collections as capital or consider the interest
income that would be generated if a portion of the capital would have been
invested in another form.
(A) be generated
if a portion of the capital would have been
(B) have been generated
if a portion of the capital would have been
(C)
be generated if a portion of the capital were
(D) be generated
if a portion of the capital was（C）
(E) be generated
if a portion of the capital had been C为什么能用were呢，a portion of the capital不是单数吗？请帮助解惑，谢谢！
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