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核酶(ribozyme)
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【简答题】There are two types of twins; identical and non-identical twins. Identical twins are formed from a single egg in mother’s body which divides to from two separate babies. Identical twins look the same,...
【简答题】A．In the 14th century. B．During the 1500s. C．Nine years before Shakespeare died. D．Nine years after Shakespeare died.
【单选题】Twins often show great ______, but these twins are an exception.
A.
likelihood
B.
resistance
C.
resemblance
D.
contradiction
【单选题】— Could you tell me ? — They are from Canada. [ ]
A.
where are the twins from
B.
where the twins are from
C.
where were the twins from
D.
where the twins were from
【单选题】The computer on the desk is ______. [ ]
A.
twins
B.
the twin's
C.
the twins
D.
the twins'
【单选题】Karen lived for _______ since she had got out of the hospital．
A.
eleven months
B.
nine months
C.
twenty months
D.
twelve months
【单选题】The passage seems to concentrate on ______.
A.
how twins are born
B.
how twins grow up
C.
characteristics of identical twins
D.
ways to distinguish twins
【单选题】'Whose bikes are these?' 'They are _____.' [ ]
A.
the twins
B.
the twins'
C.
twins
D.
twin's
【简答题】自身溶血试验的纠正试验是指加入____或____后,观察溶血是否纠正。
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