A.2’,-3’ phosphodiester bond;
B.3’,-5’ phosphodiester bond
C.2’,-5’ phosphodiester bond;
D.Hydrogen bond
E.Peptide bond
第1题
第3题
A.other animals have more control over themselves
B.humans need to cut out certain habits to achieve a healthy state
C.the different foods they eat take a hand in their different health condition
D.man's health depends on the medical treatment he gets
第4题
A.the former pay interest, whereas the latter do not
B.the former are available only at thrift institutions, whereas the latter are available only at commercial banks
C.the former do not have scheduled maturity dates, whereas the latter do
D.actually there is no distinction between these two types of deposits
第5题
A. each presents one side of the picture.
B. the first generalizes the second gives examples.
C. the second is the logical result of the first.
D. both present Richard’s virtues and faults.
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