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【单选题】
叶酸的拮抗剂是A.
次黄嘌呤
B.
胸腺嘧啶核苷
C.
HGPRT
D.
氨基蝶呤
E.
叶酸
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【简答题】We arrived too late for the concert, just as the musicians were already packing ___ their instruments.
(5.0分)A. up B. in C. with D. on
【单选题】We arrived at the small town too late, almost at midnight. We found there was no food ________ as all the shops were closed.
A.
delicious
B.
suitable
C.
available
D.
pleasant
【单选题】It 's too late when we arrived at the airport as the plane___
A.
was taking off
B.
took off
C.
had taken off
D.
has taken off
【简答题】We arrived too late for the concert, just as the musicians were already packing ___ their instruments.
【单选题】______, we arrived too late to catch the plane.
A.
Luckily
B.
Suddenly
C.
Finally
D.
unfortunately
【简答题】We arrived at the station ________ late, or we the bus. [A] too much; would catch [B] a little too; had caught [C] much too; would have caught [D] too much; would have caught
【单选题】--- You should have gone to see the film. It’s very moving. ---______, we arrived too late to catch the last bus.
A.
Absolutely
B.
Gradually
C.
Constantly
D.
Unfortunately
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