皮皮学，免费搜题
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【单选题】
青霉素在碱或酶的催化下,生成物为( )A.
青霉醛或D-青霉胺
B.
6-氨基青霉烷酸（6-APA
C.
青霉烯酸
D.
青霉酸
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He asked, "Where are you to get off, John?" He asked John where _____________ get off.
A.
was he to
B.
he was to
C.
does he to
D.
would he to
【单选题】—Where is the bookshop? —Get off the boat and go the station,you can see it. [ ]
A.
on
B.
down
C.
past
D.
pass
【单选题】Harry, would you _____ the story at the point where John left off yesterday?
A.
finish up
B.
do up
C.
take up
D.
put up
【单选题】If you're coming by train, where should you get off?
A.
At the Civic Arena Station
B.
At the San Carlos Street Station
C.
At the City Center Station
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