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【单选题】
Mrs. Obama introduced the Let’s Move _______ yesterday. Its goal is to reduce children obesity(肥胖) today and in the future.A.
challenge
B.
battle
C.
campaign
D.
behavior
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举一反三
【单选题】Some of the evidence about language in the passage is taken from the observations of ______.
A.
linguists
B.
Eskimos
C.
businessmen
D.
primitive cultures
【单选题】Passage Two Questions 6 to 10 are based on the following passage。 Why do some people live to be older than others? You know the standard explanations： keeping a moderate diet， engaging in regular exer...
A.
to see whether people’s personality affects their life span
B.
to find out if one’s lifestyle has any effect on their health
C.
to investigate the role of exercise in living a long life
D.
to examine all the factors contributing to longevity
【简答题】内力的集度称为,()
【单选题】分布内力在截面上各点的集度称为 ( ),法向分布内力的集度称为( ),用符号( )表示。
A.
应力，正应力， δ
B.
应力，正应力， σ
C.
压强，正应力， σ
D.
分布荷载，正应力， τ
【单选题】Some of the evidence about language in the passage is taken from the observations of ______.
A.
linguists
B.
Eskimos
C.
businessmen
D.
an explorer
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