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
What’’s the purpose of the proposed organization Planned Grandparenthood
A．To encourage childless couples to have children.
B．To provide facilities and services for grandchildless parents.
C．To offer counseling to people on how to raise grandchildren.
D．To discourage people from insisting on having grandchildren.
填空题
distinguished
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