单项选择题

In most American high schools, selling soft drinks is ______.

A．encouraged
B．allowed
C．unlawful
D．unprofitable
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单项选择题
The primary purpose of this passage is to ______.
A．report facts
B．call for action
C．argue for a new perspective
D．condemn a social phenomenon
单项选择题
One comparison mentioned in the last paragraph was made between ______.
A．Pacific test participants and those who undertook the Nevada test
B．Nevada atomic veterans and those who didn't take part in any nuclear tests
C．Veterans in Nevada and Pacific atomic tests and the comparison group
D．half of Nevada test participants and half of the group of no test participants
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