A．They may have taken place during take-off and landing．

　　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．

　　69．Few airlines want to impose（强加）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

　　70．Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers?

　　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 liable to be interfered with．

　　D．Because research scientists have not been able to produce the same effects in labs．

　　第二节（共5小题；每小题2分，满分10分）

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