皮皮学，免费搜题
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【单选题】
DNA和RNA共有的成分是A.
核糖
B.
脱氧核糖
C.
腺嘌呤
D.
尿嘧啶
E.
胸腺嘧啶
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皮皮学刷刷变学霸
举一反三
【单选题】It i s the second time that the poor area_______.
A.
had been visited
B.
has been visited
C.
was visited
D.
is visited
【单选题】—I think her dress comes from the 1970s. —It_________ be from that time. It looks so modern on her.
A.
mustn’t
B.
can’t
C.
won’t
D.
wouldn’t
【简答题】( 一 ) 用动词的正确形式填空 — 时态专练: 1.Sometimes, each phrase ___________(teach) a common truth. 2.I __________ (phone) my friend the other day. 3.I__________(do) my homework at this time yesterday. 4.Most of the...
【简答题】医疗机构收治的隔离传染病病人或者疑似传染病病人产生的生活垃圾属于( )性废物
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