A. Because many old people sell their houses after their children leave.B. Be
A. Because many old people sell their houses after their children leave.
Because many old houses in the bad part of the town are not inhabited.
C. Because many young people have moved into comfortable apartments.
D. Because many people have quit their old houses to build new ones.
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According to the passage, which description of the construction of massive dams and irrigation projects is incorrect？
A. They can divert the rivers.
B. They can fix more problems than they create.
C. They are built to irrigate farmland.
D. They may have brought on ecological crisis.
A. There's a paper by the door. B. The paper must have been blown
A. There's a paper by the door.
B. The paper must have been blown away.
C. The man should look around for it under the desk.
D. The man can buy another one at the corner.
A. He is good at drawing pictures. B. He likes paintings very much.
A. He is good at drawing pictures.
B. He likes paintings very much.
C. He likes visiting the art museum very much.
D. He thinks the art museum is a very quiet place.
利用电流正反馈能够得到近似的最大电流恒流过程。( )
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