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
答案:21.C 22.D 23.B 24.C 25.A
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