伸缩性和振动性较大且形式复杂的管道，一般采用的管道支架是()。
A. 弹簧吊架
B. 导向支架
C. 滑动支架
D. 滚动支架
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A．The government organized relief in conjunction with international charities.B．The go
A. The government organized relief in conjunction with international charities.
B. The government brought down grain prices by selling its stock on the open market.
C. The merchants managed to keep their stock of grain safe from the flood water.
D. The merchants pushed up grain prices twice as much in some areas.
A．When the plane was trying to take off.B．When the plane was landing.C．When the plane
A. When the plane was trying to take off.
B. When the plane was landing.
C. When the plane was flying across the Cuban-Ecuadorean border.
D. When the plane was caught in a storm.
听力原文：The possibilities of extending low-cost communications into every school, classroom, home and business seemed unparalleled because of advances in technology.
(30)
A. The government plans to expand the communication network into every part of society.
B. Thanks to technology development, people have more access to low-cost communication than before.
C. The proposal to extend low-cost communication seemed hard to be accepted because of the lack of advanced technology.
D. Every school and business is in most urgent need of advanced technology.
A．$ 4. 50 for adults and $3 for children.B．$6 for adults and $3 for children.C．$6 for
A. $ 4. 50 for adults and $3 for children.
B. $6 for adults and $3 for children.
C. $6 for adults and $4.50 for children.
D. $5.50 for adults and $2.50 for children.
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