单项选择题

Weight concentration in which area will cause a vessels bottom to be subjected to tension stresses （）

A.Aft
B.Amidships
C.At both ends
D.Forward

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To many Americans，Obamas election as President marked（）.

A.the ending of violence
B.a turning point in race relations
C.a new situation of the world
D.a change in diplomacy

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If you lose a job，you should（）.

A.feel sorry for yourself
B.get depressed for a short time
C.feel pushed to get a job
D.be optimistic about the future