24.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.
25.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
Passage Two
The rise of multinational corporations , global marketing, new communications technologies, and shrinking cultural differences have led to an unparalleled increase in global public relations or PR.
Surprisingly, since modern PR was largely an American invention, the U. S. leadership in public relations is being threatened by PR efforts in other countries. Ten years ago, for example, the world s top five public relations agencies were American-owned. In 1991, only one was. The British in particular are becoming more sophisticated and creative. A recent survey found that more than half of all British companies include PR as part of their corporate planning activities, compared to about one-third of U. S. companies. It may not be long before London replaces New York as the capital of PR.
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