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【单选题】
质反应中药物的ED50是指药物A.
和50%受体结合的剂量
B.
引起50%动物阳性效应的剂量
C.
引起最大效能50%的剂量
D.
引起50%动物中毒的剂量
E.
达到50%有效血浓度的剂量
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举一反三
【单选题】Do Paul and his son have a reservation?
A.
No, they decided to come back the next day.
B.
No, they will come back soon.
C.
No, they don't want to sit by the fence.
【单选题】听力原文：W：Paul would be much wiser to continue with his study of master's degree than to rush back home for taking a job． M：After graduation，he may find more chances for a better job, I think． Q：What doe...
A.
Paul should go back home.
B.
Paul is so wise to get a better job.
C.
Paul should continue with his study.
D.
Paul is sure to get the degree.
【单选题】Paul earns very little as a classical cellist, ______ his brother's pop musicals have made millions.
A.
in contrast to
B.
compared with
C.
whereas
D.
though
【单选题】Paul eventually came to Kate's house with a police officer, ________ he was reunited with his car. [ ]
A.
where
B.
which
C.
that
D.
there
【简答题】Do Paul and his son have a reservation?
【简答题】Paul is a worker. One of his feet is bigger than 1 . He can’t 2 the right shoes 3 his feet. His friend, Dick, says to him, “ 4 don’t you go to a shoemaker(鞋匠) ? A shoemaker can 5 you the right shoes.”...
【简答题】阅读理解。 His name is Paul. He is from England, and he's thir years. His birthday is December 16th. He gets up at 6:00. He goes to school at 7:00. He has four classes in the morning. He does exercises...
【简答题】上述哪种病有三个基本特点：严重的细胞免疫缺陷；发生各种致命的机会感染；发生各种恶性肿瘤
【单选题】—What’s the matter with Paul? —A letter from his parents in New Jersey _________ as attack of homesickness.
A.
set out
B.
set about
C.
set up
D.
sent off
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