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【单选题】
阿司匹林抗血小板聚集的机制是（）。A.
影响花生四烯酸代谢
B.
竞争性抑制维生素K环氧化物还原酶
C.
激活腺苷酸环化酶，抑制磷酸二酯酶
D.
激活抗凝血酶Ⅲ
E.
催化纤溶酶原转变为纤溶酶
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举一反三
【单选题】Birds, _______ or familiar, were popular in Rome.
A.
historic
B.
exotic
C.
alcoholic
D.
erotic
【单选题】The giant was sad because there were no birds, flowers and leaves outside the garden.
A.
真
B.
False
【单选题】Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
A.
which
B.
what
C.
when
D.
how
【单选题】The yellows used to paint the sun were only faintly _________ from the other yellows used throughout the whole day.
A.
disproved
B.
differentiated
C.
discriminated
D.
discerned
【单选题】The birds were very friendly to Bill Pochmerski, one of the volunteer observers, because he wore a neutral mask.
A.
Y
B.
N
C.
NG
【单选题】We rented the old house on the ______ that the landlord would paint it, but we were disappointed later.
A.
reassurance
B.
assurance
C.
assumption
D.
acknowledgement
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