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【单选题】
The little baby was left alone, with ______ to look after it.A.
a. someone
B.
b. anyone
C.
c. not one
D.
d. no one
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反馈参考答案：
举一反三
【简答题】SDS-PAGE(SDS polyacrylamide gel electrophoresis)。
【简答题】在用SDS分离DNA时，要注意SDS的浓度，0.1%和1%的SDS的作用效果是不同的，前者______，后者______。
【单选题】. ---Do you have the Harry Potter books by JK Rowling in your shop? ---Sorry, there is___________left at the moment.
A.
nothing
B.
no one
C.
none
D.
not one
【单选题】Tom ______ better than to ask Harry for help.
A.
should have known
B.
shouldn't know
C.
ought to knew
D.
will be known
【单选题】Harry seemed to have learned nothing from the failures of his ___________ so he met with credit crisis in the company.
A.
predecessors
B.
participants
C.
constituents
D.
successors
【简答题】SDS聚丙烯酰胺凝胶电泳(SDS-polyaerylamide gel electrophoresis，SDS-PAGE)
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