单项选择题

A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
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单项选择题
A．To introduce the woman to someone who has researched blushing.B．To illustrate the benefits of a public speaking class.C．To give an example of an adult who blushes easily.D．To explain a way to overcome blushing.
A．To introduce the woman to someone who has researched blushing.
B．To illustrate the benefits of a public speaking class.
C．To give an example of an adult who blushes easily.
D．To explain a way to overcome blushing.
单项选择题
A．The first period of cold, wintry days in autumn.B．The turning of color and falling of leaves.C．A large mass of warm tropical air carried northward.D．The southwestern winds.
A．The first period of cold, wintry days in autumn.
B．The turning of color and falling of leaves.
C．A large mass of warm tropical air carried northward.
D．The southwestern winds.
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