单项选择题

Why do dolphins attach each other head-to-head

A．They are making fun of each other.
B．They are doing exercise.
C．They are trying to damage the hearing system of their opponents.
D．They are gang raping.

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单项选择题

Which of the following is not emphasized by contemporary American society

A．Physical.
B．Biological sciences.
C．Engineering.
D．Art.

单项选择题

Many museums now provide educational services and children's departments. ______the usual displays, they also offer film showings and dance programs.

A．As well as
B．Rather than
C．With the exception of
D．In addition to