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【单选题】
选择性作用于β受体的药物是A.
多巴胺
B.
多巴酚丁胺
C.
肾上腺素
D.
氨茶碱
E.
麻黄碱
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反馈参考答案：
举一反三
【单选题】_______ his membership card, Tony decided to make a phone call to check whether there was something wrong．
A.
Not having received
B.
Not to receive
C.
Not received
D.
Having not received
【单选题】When buying a new sedan, drivers are strongly recommended to check whether the vehicle meets the government standards______fuel efficiency.
A.
at
B.
to
C.
as
D.
for
【简答题】系动词也称联系动词(Linking Verb),是用来辅助主语的动词。可以分为____、____、____、____、____、和____。
【简答题】纳米材料的四大效应是什么?
【单选题】____his membership card，Tony decided to make a phone call to check whether there was something wr
A.
31．____his membership card，Tony decided to make a phone call to check whether there was something wrong． A．Having not received
B.
Not receiving
C.
Not received
D.
Not having received
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