详解:答案为D。本题考察细节,答案见文中第一段"that could have been caused by electromagnetic interference"。
3. Few airlines want to impose a total ban on their passengers using electronic devices because______.
A. they don\'t believe there is such a danger as radio interference
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
Best Answer:B
详解:答案为B。根据文中第三段,电磁波的害处还有待于进一步弄清。因此很少有航空公司想全面禁止乘客使用电子装置,而且有些乘客也想在飞机旅途中工作。
4. Why is it difficult to predict the possible effects of electromagnetic fields on an airplane\'s computers?
A. Because it is extremely dangerous to conduct such research on an airplane.
B. Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because research scientists have not been able to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.
Best Answer:C
详解:答案为C。见文中第三段最后一句。
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