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【单选题】
以下步骤中，连续法测活的正确顺序为何？①利用分光光度计连续测定吸光度的变化②将适量酶加入底物溶液中，快速混合③利用吸光度变化的动力学曲线计算酶活力 ④将酶与底物的混合液迅速转移入比色杯中，放入分光光度计A.
①②③④
B.
②④①③
C.
③④①②
D.
②①④③
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【单选题】What do some scientists say about taking medicines for the common cold according to the passage?
A.
It is good for people.
B.
It actually does more harm than good.
C.
It can help people keep healthy.
D.
It can give them more energy.
【单选题】According to the passage, some plant diseases can be prevented by
A.
killing parasites
B.
inoculation
C.
killing insects
D.
improving growing conditions
【单选题】— Can I have _____________ envelope and some _____________? — Sure, here you are. [ ]
A.
an; writing paper
B.
a; writing papers
C.
a; writing paper
【单选题】Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remains______ .
A.
to be shown
B.
to have shown
C.
to have been shown
D.
being shown
【单选题】What is the myth held by some 'superwomen'?
A.
That they can reconcile their careers with parental responsibilities.
B.
That they can devote themselves to their career without regard for their children.
C.
That they can resist the temptation of their ambition to make great achievements.
D.
That they can resolve the conflicts between their careers and children without any sacrifice.
【单选题】Where do people shake their heads in a rotating movement to signify agreement?
A.
In some parts of the Western world.
B.
In Bulgaria.
C.
In India.
D.
Both A and B
【简答题】Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer ______ (show)
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