单项选择题

The old lady was very fond of walking and she used to go out every day in all_________.

A．temperatures
B．weathers
C．climates
D．atmospheres
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单项选择题
Scientists have spent years_________ into the effects of certain chemicals on the human brain with no results.
A．studying
B．investigating
C．researching
D．inspecting
单项选择题
The basic causes are unknown, although certain conditions that may lead to cancer have been_________
A．notified
B．qualified
C．identified
D．satisfied
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