单项选择题

A．doing without
B．putting up
C．getting rid of
D．dropping out
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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．regards it as unreasonable to exercise a total ban during flight
C．hasn’t formed his own opinion on this problem
D．has overestimated the danger of electromagnetic interference
单项选择题
The best title for this passage would be ______.
A．Research on Radiation
B．Effects of Space Radiation
C．Importance of Protection against Radiation
D．The Atmosphere and Our Environment
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