英语阅读题,Directions:After reading the passage,you are required
来源:学生作业帮 编辑:大师作文网作业帮 分类:英语作业 时间:2024/09/23 11:25:51
英语阅读题,
Directions:After reading the passage,you are required to complete the statements that follow the questions (No.56 through No.60).You should write your answers in not more than 3 words on the Answer Sheet correspondingly.
As in the field of space travel,so in undersea exploration new technologies continue to appear.They share a number of similarities with each other---as well as some important differences.
Manned submersibles,like spaceships,must maintain living conditions in an unnatural environment.But while a spaceship must simply be sealed against the vacuum space,a submersible must be able to bear extreme pressure if it is not break up in deep water.
In exploring space,unmanned vehicles were employed before astronauts.In undersea exploration,on the other hand,men paved the way,and only recently have unmanned remote-operated vehicles been put to use.
One reason for this is that communicating with vehicles in orbit is much easier than talking to those underwater.A vacuum is an ideal medium for radio communications,but underwater communications are limited to much slower sound waves.Thus,most undersea vehicle---particularly remote-operated vehicles---operated at the end of long ropes.
For a similar reason,knowing where you are undersea is much more difficult than in space.A spaceship’s position can be located by following its radio signal,or by using telescopes and radar.For an undersea vehicle,however,a special network of sonar devices must be laid out in advance on the ocean floor in the area of a dive to locate the vehicle’s position.
Though undersea exploration is more challenging than outer space in a number of respects,it has a distinct advantage:Going to the ocean depths doesn’t make it necessary to escape the Earth’s gravity.Thus,it remains far less expensive.
56.Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the _______________________.
57.What does the author mean by saying “more challenging” in the last paragraph?
____________________________________________.
58.Why is ocean exploration not so expensive as space travel?
Because ______________________ for submersibles to get away from the Earth’s gravity.
59.When must the sonar devices be placed?
Before the _________________________.
60.What will happen to a submersible in deep water if it is not well built?
It is most likely to ___________________________________.
Directions:After reading the passage,you are required to complete the statements that follow the questions (No.56 through No.60).You should write your answers in not more than 3 words on the Answer Sheet correspondingly.
As in the field of space travel,so in undersea exploration new technologies continue to appear.They share a number of similarities with each other---as well as some important differences.
Manned submersibles,like spaceships,must maintain living conditions in an unnatural environment.But while a spaceship must simply be sealed against the vacuum space,a submersible must be able to bear extreme pressure if it is not break up in deep water.
In exploring space,unmanned vehicles were employed before astronauts.In undersea exploration,on the other hand,men paved the way,and only recently have unmanned remote-operated vehicles been put to use.
One reason for this is that communicating with vehicles in orbit is much easier than talking to those underwater.A vacuum is an ideal medium for radio communications,but underwater communications are limited to much slower sound waves.Thus,most undersea vehicle---particularly remote-operated vehicles---operated at the end of long ropes.
For a similar reason,knowing where you are undersea is much more difficult than in space.A spaceship’s position can be located by following its radio signal,or by using telescopes and radar.For an undersea vehicle,however,a special network of sonar devices must be laid out in advance on the ocean floor in the area of a dive to locate the vehicle’s position.
Though undersea exploration is more challenging than outer space in a number of respects,it has a distinct advantage:Going to the ocean depths doesn’t make it necessary to escape the Earth’s gravity.Thus,it remains far less expensive.
56.Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
It is because of the _______________________.
57.What does the author mean by saying “more challenging” in the last paragraph?
____________________________________________.
58.Why is ocean exploration not so expensive as space travel?
Because ______________________ for submersibles to get away from the Earth’s gravity.
59.When must the sonar devices be placed?
Before the _________________________.
60.What will happen to a submersible in deep water if it is not well built?
It is most likely to ___________________________________.
56 radio communications problems.
57 maintain living conditions
58 it is unnecessary
59 undersea vehicle dives
60 break up
57 maintain living conditions
58 it is unnecessary
59 undersea vehicle dives
60 break up
英语阅读题,Directions:After reading the passage,you are required
Directions:After reading the following passage ,you are requ
Task 5Directions:Read the following passage.After reading yo
Directions: Reading the following passage
关于图表英语作文写一篇英语作文,Directions:For this part you are required to
英文情景对话Topic 1Directions:You are required to talk about the w
英语短篇作文Directions:For this part you are required to write a c
英语作文 要求如下Directions:For this part,you are required to write
英语不接受邀请的作文Directions:In this part,you are required to write
英语写作题目Directions:For this part you are required to write a c
Directions:For this part,you are required to writ
Directions:You are required to write a composition about BOO