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【简答题】
无菌检验操作应在洁净度为( )单向流空气区域内进行。
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举一反三
【单选题】I could never be so ___________without your help.
A.
succeed
B.
successful
C.
succeeded
D.
success
【简答题】I could never be so ______ (成功的) without your help.
【单选题】Now most Chinese families in the country have their own houses ________ [ ]
A.
to live
B.
living
C.
living in
D.
to live in
【单选题】Mr Li always ______ weekends playing ping pang with his son. [ ]
A.
spends
B.
costs
C.
takes
【简答题】Mr Li a_____ his son to play computer s once a week.
【单选题】听力原文：(A) There are many houses at the bottom of the hill. (B) Trees have lost most of their leaves. (C) Smoke is rising from the chimney. (D) Many pipes are being installed.
A.
B.
C.
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