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At 11：06 a.m.on Feb.27，China's Long March-8 Y2 carrier rocket took off from the Wenchang Space Launch Site in south China's Hainan province，with a total of 22 satellites on board.The successful launch marked the highest record for the total number of satellites sent into space by a single rocket in China.
   The 22 commercial satellites launched aboard the Long March-8 Y2 carrier rocket are mainly used for Earth observation，Internet of Things （IoT） communications，and scientific experiments，and are able to provide services including survey of resources，in-orbit scientific experiment，and collection of information about ships.
   To ensure that the 22 commereial satellites are sent into their orbits successfully，researchers needed to first figure out the "seating arrangement" for them.Based on the shapes and needs of these satellites，researchers eventually created a three-story machine that could ensure a comfortable "seat" in the limited space for each satellite.
   Since these satellites need to leave the carrier rocket when they enter space，scientists must take into consideration deviations （偏差） in movements caused by different ways in which satellites separate from the rocket and energy sources they use during the process.The research and development team of the Long March-8 Y2 carried out many rounds of calculations （計算） for the deviations in the movements of the rocket and satellites to make sure all the 22 satellites can "get off" the launch vehicle safely.
   Compared with the traditional practice of launching a single satellite with one rocket，using one rocket to send many satellites into orbits can put the carrying ability of the rocket to better use，improve efficiency （效率） and reduce the cost of satellite launch，according to experts.

（1）What is Paragraph 2 mainly about？
B
B

A．The differences between rockets.
B．The tasks for the 22 satellites.
C．The achievements of scientific experiments.
D．The technology applied to the rocket.
（2）Why was the three-story machine created？
C
C

A．To store the satellites properly.
B．To record satellite observation data.
C．To ensure the rocket worked properly
D．To make sure the rocket was small enough.
（3）Why do scientists have to consider deviations in movements？
D
D

A．To recycle the carrier rocket regularly.
B．To deal with emergencies in time.
C．To make satellites stay in orbit longer.
D．To free the satellites successfully.
（4）What do the experts think of the Long March-8 Y2 rocket？
A
A

A．It has many advantages.
B．It faces many risks.
C．It provides inspiration for future rockets.
D．It will be improved in the future.

【考點】航空航天；新聞報道．
【答案】B；C；D；A
【解答】
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發(fā)布：2024/4/20 14:35:0組卷：36引用：1難度：0.5
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