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【单选题】
免疫球蛋白单体分子的基本结构A.
2条多肽链构成
B.
4条多肽链构成
C.
铰链区连接的2条多肽链构成
D.
二硫键连接2条多肽链构成
E.
二硫键连接2条相同的L链和2条相同的H链构成
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举一反三
【单选题】Greater effort to increase food production must be made if we ______ meet an increasing demand by the growing population.
A.
can
B.
may
C.
are to
D.
should
【单选题】Futurists claim that we must______.
A.
increase the production of literature
B.
use' poetry to relieve modem stress
C.
develop new modes of expression
D.
avoid using adjectives and verbs
【单选题】17) We know with certainty that a tax increase must cause which of the following?
A.
no change in investment
B.
a reduction in investment
C.
an increase in investment
D.
none of the above
【单选题】As citizens of advanced but vulnerable economies, we must either relentlessly increase the quality of our skills or see our standard of living erode. For the future, competition between nations will b...
A.
Oil.
B.
Technological skill.
C.
Natural resources.
D.
Education.
【单选题】Futurists claim that we must ______.
A.
increase the production of literature
B.
use poetry to relieve modern stress
C.
develop new modes of expression
D.
avoid using adjectives and verbs
【单选题】Computers ______ their place in ordinary people’s homes.
A.
have been found
B.
found
C.
find
D.
have found
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