Why did the scientists study the width of the tree rings、-最需题库

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1On the whole, this story is about_________.
A.why tree trunks grow bigger.
B.why scientists study tree rings.
C.trees that lived hundreds of years ago.
D.the ponderosa pines in the American Southwest.
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2A tree rows a new layer of wood__________.
A.each week
B.whenever it rains
C.every year
D.every season
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3The story does not say so, but it makes you think that_________.
A.a tree grows faster when it has a lot of water.
B.scientists cut down trees to study tree rings.
C.pine trees form wide rings every year.
D.the ponderosa pine grows in the Southwest
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4Which of the following is NOT true、
A.People in Yucatan always give right directions.
B.There are different ways to give directions in different parts of the world.
C.People in some places give directions in miles, but people in other places give directions in time.
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5Where is Yucatan、
A.In the USA.
B.In Japan.
C.In Greece.
D.In Mexico.
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6Which of the following does this story lead you to believe、
A.Young trees have few annual rings.
B.The trunk of a tree never changes in size.
C.Trees in the Southwest do not need rain.
D.The soil in the Southwest it fit for the growth of trees.
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7Some middle schools in Australia have banned students from carrying mobile phones _________.
A.because they are students
B.when they are free
C.when they are at school
D.because they are children
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8What does the underlined word “cheat” mean in the passage、
A.聊天
B.核对
C.查询
D.作弊
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9Some parents felt unhappy because they couldn’t _________ during school hours.
A.use their mobile phones
B.leave their mobile phones at school office
C.help the teachers with their work
D.get in touch with their children
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10What was the young officer supposed to do、
A.Train the soldiers.
B.Attack the soldiers.
C.Shoot the soldiers.
D.Like the soldiers.
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