The U.S.will come to lose its leading place in technology probably because
A.the number of PhD degree holders is declining.
B.the number of scientists and engineers is decreasing.
C.the number of 22-year-olds is declining.
D.scientists and engineers are not employed.
第1题
Which of me following is needed to make the trumpet work?
A.Keen eyesight.
B.Long fingers.
C.Air pressure.
D.Daily cleaning.
请帮忙给出正确答案和分析,谢谢!
第2题
Todays trumpet is similar to its ancestors EXCEPT that
A.they are all hollow tubes.
B.they are all blown.
C.they all use the players" lips to produce the basic sound.
D.they are all made by hand.
请帮忙给出正确答案和分析,谢谢!
第3题
Why was the catalog used as textbooks?
A.It helped students with spelling and adding.
B.It helped students become familiar with a variety of goods.
C.Students might order things from the catalog.
D.Schools were short of textbooks at that time.
请帮忙给出正确答案和分析,谢谢!
第4题
Who were the main customers of Sears and Wards business?
A.Farmers.
B.City people.
C.Business people.
D.Students.
请帮忙给出正确答案和分析,谢谢!
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