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【单选题】
划分完全竞争市场和垄断市场的主要依据是( )。A.
市场信息是否对称
B.
所生产的产品是否具有差别性
C.
生产者的数量是否足够多
D.
市场是否存在进入障碍
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【单选题】Exercise helps pain sufferers to recover more quickly than traditional treatmentA.Right #
A.
Exercise helps pain sufferers to recover more quickly than traditional treatment A.Right
B.
Wrong
C.
Not mentioned
【单选题】已知集合U={1，2，3，4，5，6，7}，A={2，4，5，7}，B={3，4，5}，则（C U A）∪（C U B）= [ ]
A.
{1，6}
B.
{4，5}
C.
{2，3，4，5，7}
D.
{1，2，3，6，7}
【简答题】已知全集∪={1，2，3，4，5，6，7，8}，A={1，2，4}，B={2，4，5}，P={4，7，8}，求： （1）（ B）∪A； （2）（A∩B）∩（ P）。
【单选题】Exercise helps to take the pressure off the site of pain.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Just as exercise helps _______our bodies, reading helps _____ our mind, broadening our vision into the world [ ]
A.
found; found
B.
to put up; to put up
C.
to build up; to build up
D.
to set up; to set up
【单选题】Exercise helps ______. [ ]
A.
to keep health
B.
to keep in good health
C.
keeping healthy
【单选题】Which is the best title for this passage?
A.
How Exercise Helps Diabetes
B.
The Secret Between Diabetes And Exercise
C.
Getting Rid of Diabetes
D.
The Cure For Diabetes
【简答题】A good exercise program helps teach people to avoid the habits that might shorten the lives.
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