单项选择题

A．ways
B．steps
C．approaches
D．responses
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单项选择题
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 experts lack adequate equipment to do such research.
C．Because research scientists have not been able to produce the same effects in labs.
D．Because it remains a mystery what wavelengths are liable to be interfered with.
单项选择题
Which statement can be the best title for this article
A．Dr. Randy Nelson and His New Findings.
B．Animals Resistance to Cancer.
C．Winter and Animals’ Immune System.
D．A Light in the Cancer Darkness.
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