单项选择题

We learn from the third paragraph that employees in the American PR industry ______.

A．speak at least one foreign language fluently
B．are ignorant about world geography
C．are not as sophisticated as their European counterparts
D．enjoy reading a great variety of English business publications
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单项选择题
It can be inferred from the passage that the author ______.
A．is in favor of prohibiting passengers' use of electronic devices completely
B．has overestimated the danger of electromagnetic interference
C．hasn't formed his own opinion on this problem
D．regards it as unreasonable to exercise a total ban during flight
单项选择题
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
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