单项选择题

A．Brain.
B．Heart.
C．Brain and muscle.
D．Brain and heart.
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单项选择题
The hydra is a kind of ________.
A．flatworm
B．coelenterate
C．sea anemone
D．nerve cell
单项选择题
A．She wants a copy of the article.B．She doesn’’t want the copy because it costs too much.C．The article is much too difficult to understand.D．It doesn’’t matter to her.
A．She wants a copy of the article.
B．She doesn’’t want the copy because it costs too much.
C．The article is much too difficult to understand.
D．It doesn’’t matter to her.
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