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【简答题】
在紫外一可见分光光度计中，在可见光区使用的光源是________灯，所用比色皿和棱镜的材料一般为_________；而在紫外光区使用的光源是_________灯，所用比色皿和棱镜的材料应为_________。
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【单选题】In my hometown, there is always a harvest supper for the farmers after all the wheat ____ cut.
A.
will have been
B.
was
C.
will be
D.
has been
【单选题】Because agriculture is so important to a nation's well-being, governments have always been concerned with it. For example, the United States and Canada have long produced surpluses that complicate the...
A.
they throw the country into great disorder
B.
they entail more expenditure on the part of the government
C.
they usually involve direct governmental support price
D.
the government has to set up special pricing systems
【单选题】In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.
A.
will have been
B.
will be
C.
was
D.
has been
【单选题】Farmers have always had a particular interest in the weather, because it ( ) their work.
A.
accelerates
B.
effects
C.
affects
D.
exerts
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