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【简答题】
分步骤简述母种培养基的配制方法。
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举一反三
【单选题】— Why does she look so tired? — She ____homework all the morning and she still hasn't finished it. [ ]
A.
is doing
B.
has done
C.
has been doing
D.
was doing
【单选题】—Lily dances so well . Where was she trained? —She learns all by herself .She _______goes to any training class.
A.
usually
B.
often
C.
even
D.
never
【单选题】She found that she herself couldn't do all the housework, so she hired a ______.
A.
guide
B.
clerk
C.
maid
D.
chief
【单选题】She has _____she remembers all the names of the students she has taught.
A.
so good memory that
B.
such a good memory that
C.
such good memory that
D.
good memory
【单选题】– Why does she look so tired? -- She ________ all the morning and she still hasn’t finished it.
A.
cleaned
B.
was cleaning
C.
has been cleaning
D.
has cleaned
【简答题】为什么要进行井下作业有关设备的试压?
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