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【单选题】
下列关于自由基的说法错误的是()A.
自由基是体内各种生化反应的中间代谢产物，在人体的生命活动中，各种生化反应产生各种自由基。
B.
自由基含有未配对电子，是一类具有高度化学活性的物质。
C.
自由基一旦产生就会对人体造成严重危害。
D.
正常情况下，体内自由基处于不断产生与清除的动态平衡之中，并在代谢中发挥着重要作用。
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【单选题】．What sets human beings apart from animals is not the pursuit of happiness, but the pursuit of meaning, ________ is unique to humans.
A.
that
B.
what
C.
which
D.
as
【单选题】What is the passage mainly about?
A.
The custom of sharing food
B.
The specific meaning of food
C.
The role of food in ceremonies.
D.
The importance of food in culture.
【简答题】The student spent a lot of time to improve the ac______ of what he has written in the sense of meaning.
【单选题】What does the professor mean when he says this:
A.
He is certain the students know the meaning of the word.
B.
He wants to make sure that students have understood his explanation.
C.
He is worried his students have not covered all the material so far.
D.
He wants to check whether his students have studied the material so far.
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