皮皮学，免费搜题
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【单选题】
单证工作中,联合国推荐使用标准的货币代号和代码,其中美元的代码是( )A.
US$
B.
502
C.
USD
D.
$
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皮皮学刷刷变学霸
举一反三
【单选题】Tom ________ the radio when I came in.
A.
listened to
B.
was listening to
C.
listened
D.
was listening
【单选题】In a pre-listening activity， students need to learn to cope with some ambiguity in listeningand realize that they can still learn even when they do not understand every single word. The aimof this act...
A.
listening fir specific information
B.
listening for gist
C.
listening for structure
D.
listening for vocabulary
【单选题】Li Lei wants to be a singer.He music. [ ]
A.
enjoy listening
B.
enjoys to listen to
C.
enjoys listening to
D.
enjoy listening to
【简答题】根据观测误差对观测结果影响的性质,可将误差分为 和 。
【简答题】根据观测误差对观测结果影响的性质,可将误差分为 、 和 三种。
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