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
(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)
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. (A) be generated (B) have been generated (C) (D) be generated (E) be generated 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！
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.
if a portion of the capital would have been
if a portion of the capital would have been
be generated if a portion of the capital were
if a portion of the capital was
if a portion of the capital had been
198.should be 是"应该..",人怎么能应该被陨石砸呢
123.ALL+不可数名词,谓语用单数
118.虚拟语气 (与現在事实相反)
If S1 + ( Vpt / were ) ..., S2 + would + V
--> be动詞一定要用were
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