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【单选题】
MHC分子中不参与构成抗原结合槽的结构域是A.
Ⅰ类分子的α 1
B.
Ⅰ类分子的α 2
C.
Ⅰ类分子的α 3
D.
Ⅱ类分子的α 1
E.
Ⅱ类分子的β 1
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举一反三
【单选题】When we meet some new words, we’d better in a dictionary.
A.
look them up
B.
look them out
C.
look out them
D.
look up them
【单选题】When we meet some new words, we'd better ______ in a dictionary. [ ]
A.
look out them
B.
look them out
C.
look them up
D.
look up them
【单选题】We______neighbors for help when we move to a new place.
A.
look for
B.
look to
C.
see to
D.
see off
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