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RTCA, an organization which advises the aviation(航空) industry, has recommended that all airlines ban such devices from being used during “critical” stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to place a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft’s computers. Experts know that portable devices give out radiation which affects those wavelengths which aircraft use for navigation(导航) and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be damaged by interference raises the risk terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
1. The passage is mainly about ______.
A. effective safety measures for air flight
B. a possible cause of aircraft crashes
C. the faults of electronic devices
D. a new regulation for all airlines
2. Few airlines want to place a total ban on their passengers using electronic devices because ______.
A. they have other effective safety measures to fall back on
B. they don’t believe there is such a danger as radio interference
C. the harmful effect of electromagnetic interference is yet to be proved
D. most passengers refuse to take a plane which bans the use of radio and cassette players
3. Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computer?
A. Because experts lack adequate equipment to do such research.
B. Because it is extremely dangerous to conduct such research on an airplane.
C. Because it remains a mystery what wavelengths are easier to be interfered with.
D. Because research scientists have not been able to produce the same effects in labs.
4. It can be inferred from the passage that the author ______.
A. hasn’t formed his own opinion on this problem
B. has overestimated the danger of electromagnetic interference
C. regards it as unreasonable to exercise a total ban during flight
D. is in favor of prohibiting passengers’ use of electronic devices completely
查看习题详情和答案>>
The biggest safety threat facing airlines today may not be a terrorist with gun, but man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference(电磁干扰). The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation(航空) industry, has recommended that all airlines ban such devices from being used during “critical” stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to place a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft’s computers. Experts know that portable devices give out radiation which affects those wavelengths which aircraft use for navigation(导航) and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be damaged by interference raises the risk terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too loud.
1. The passage is mainly about ______.
A. effective safety measures for air flight
B. a possible cause of aircraft crashes
C. the faults of electronic devices
D. a new regulation for all airlines
2. Few airlines want to place a total ban on their passengers using electronic devices because ______.
A. they have other effective safety measures to fall back on
B. they don’t believe there is such a danger as radio interference
C. the harmful effect of electromagnetic interference is yet to be proved
D. most passengers refuse to take a plane which bans the use of radio and cassette players
3. Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computer?
A. Because experts lack adequate equipment to do such research.
B. Because it is extremely dangerous to conduct such research on an airplane.
C. Because it remains a mystery what wavelengths are easier to be interfered with.
D. Because research scientists have not been able to produce the same effects in labs.
4. It can be inferred from the passage that the author ______.
A. hasn’t formed his own opinion on this problem
B. has overestimated the danger of electromagnetic interference
C. regards it as unreasonable to exercise a total ban during flight
D. is in favor of prohibiting passengers’ use of electronic devices completely
查看习题详情和答案>>
The biggest safety threat facing airlines today may not be a terrorist with gun, but man with the portable computer in business class. In the last 15 years,pilots have reported well over 100 incidents that could have been caused by electromagnetic interference（电磁干扰）. The source of his interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radios and cassette players and mobile telephones.
RTCA, an organization which advises the aviation（航空）industry,has recommended that all airlines ban such devices from being used during “critical” stages of flight, particularly takeoff and landing. Some experts have gone further,calling for a total ban during all flights. Currently（当前，时下）, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during takeoff and landing, most are reluctant to place a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft's computers. Experts know that portable devices give out radiation which affects those wavelengths which aircraft use for navigation（导航）and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be damaged by interference raises the risk terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.
(1)The passage is mainly about ____.
[ ]
A．effective safety measures for air flight
B．a possible cause of aircraft crashes
C．the faults of electronic devices
D．a new regulation for all airlines
(2)Few airlines want to place a total ban on their passengers using electronic devices because _____.
[ ]
A．they have other effective safety measures to fall back on
B．they don't believe there is such a danger as radio interference
C．the harmful effect of electromagnetic interference is not yet to be proved
D．most passengers refuse to take a plane which bans the use of radio and cassette players
(3)Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computer?
[ ]
A．Because experts lack adequate equipment to do such research.
B．Because it is extremely dangerous to conduct such research on an airplane.
C．Because it remains a mystery what wavelengths are easier to be interfered with.
D．Because research scientists have not been able to produce the same effects in labs.
(4)It can be inferred from the passage that the author ____.
[ ]
A．hasn't formed his own opinion on this problem
B．has overestimated the danger of electromagnetic interference
C．regards it as unreasonable to exercise a total ban during flight
D．is in favor of prohibiting passengers'use of electronic devices completely
查看习题详情和答案>>with the portable computer in business class. In the last 15 years, pilots have reported well over
100 incidents that could have been caused by electromagnetic interference. The source of this
interference remains unconfirmed, but increasingly, experts are pointing the blame at portable
electronic devices such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the av
iation(航空) industry, has recommended that allairlines ban such devices from being used during "critical" stages of flight, particularly take-off
and landing. Some experts have gone further, calling for a total ban during all flights. Currently,
rules on using these devices are left up to individual airlines. And although some airlines prohibit
passengers from using such equipment during take-off and landing, most are reluctant to enforce
a total ban, given that many passengers want to work during flights.
The difficulty is predicting how electromagnetic fields might affect an aircraft's computers.
Experts know that portable devices emit radiation which affects those wavelengths which
aircraft use for navigation and communication. But, because they have not been able to reproduce
these effects in a laboratory, they have no way of knowing whether the interference might be
dangerous or not.
The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that
terrorists may use radio system in order to damage navigation equipment. As worrying, though,
is the passenger who can't hear the instructions to turn off his radio because the music's too loud.
B. the defects of electronic crashes
C. a possible cause of aircraft crashes
D. effective safety measures for air flight
B. They may have taken place during take off and landing.
C. They were proved to have been caused by the passengers' portable computers.
D. They were suspected to have resulted from electromagnetic interference.
l ban on their passengers using electronic devices because _______.B. the harmful effect of
electromagnetic interference is yet to be proved.C. most passengers refuse to take a plane which bans the use of radio and cassette players.
D. they have other effective safety measures to fall back on.
computers?______
B. Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because research scientists have not been to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.
B. has overestimated the danger of electromagnetic interference
C. hasn't formed his own opinion on this
problemD. regards it as unreasonable to exercise a total ban during flight
a gun, but the man with the portable computer in business class. In the last 15 years,
pilots have reported well over 100 incidents that could have been caused by electromagnetic
(电磁) interference (干扰). The source of this interference remains unconfirmed, but
increasingly, experts are pointing the blame at portable electronic device such as portable
computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation (航空) industry, has recommended that
all airlines ban (禁止) such devices from being used during "critical" stages of flight,
particularly take-off and landing. Some experts have gone further, calling for a total ban
during all flights. Currently, rules on using these devices are left up to individual
airlines. And although some airlines prohibit (禁止) passengers from using such equipment
during take-off and landing, most are reluctant to enforce a total ban, given that many
passengers want to work during flights.
The difficulty is prediction how electromagnetic fields might affect an aircraft's
computers. Experts know that portable device emit radiation which affects those wavelengths
which aircraft use for navigation and communication. But, because they have not been able
to reproduce these effects in a laboratory, they have no way of knowing whether the
interference might be dangerous or not.
The fact that aircraft may be vulnerable (易受损的) to interference raises the risk
that terrorists may use radio systems in order to damage navigation equipment. As worrying,
though, is the passenger who can't hear the instructions to turn off his radio because the
music is too loud.
B. a possible cause for air flight accidents
C. the defects (缺点) of electronic devices
D. a new regulation for all airlines
B. They may have been caused by the damage to the radio systems.
C. They were suspected to have resulted from electromagnetic interference.
D. They were proved to have been caused by the passengers' portable computers.
devices because _____.
B. they don't believe there is such a danger as radio interference
C. the harmful effect of electromagnetic interference is yet to be proved
D. most passengers refuse to take a plane which bans the use of radio and cassette players
airplane's computers?
B. Because it is extremely dangerous to conduct such research on an airplane.
C. Because it remains a mystery what wavelengths are liable to e interfered with.
D. Because research scientists have not been able to produce the same effects in labs.
B. has overestimated the danger of electromagnetic interference
C. thinks it is unreasonable to exercise a total ban during flight
D. is in favor of prohibiting passengers' use of electronic devices completely