单项选择题

In the informal meeting the exporter learned that the importer was interested purchase rather than prepacked sets of 12.

A．in bulk
B．in essence
C．at random
D．at ease

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单项选择题

From the passage, ______ are most likely to catch colds

A．infant boys
B．young girls
C．teenage boys
D．elderly women

单项选择题

According to the passage, why couldn’t PET and functional M. R. I. scans detect subtle changes in blood flow earlier

A．Because there is early oxygen transfer.
B．Because they do not form their images quickly enough to follow such rapid changes.
C．Because researchers control the changes in blood flow.
D．Because early oxygen transfer gives the flow blood energy.

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