单项选择题

His success was due partly to ______ he had been working hard.

A．that
B．being followed
C．the fact which
D．having followed
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单项选择题
What characteristics make dolphins easy to train as star performers
A．High intelligence.
B．Sociability.
C．Enjoying playing with each other and also with the humans, with whom they come in touch.
D．Being able to remember humans that they have met.
单项选择题
What characteristics seem to be very strong among the cetaceans
A．Being able to live both on land and in the sea.
B．A sense of family and a spirit of cooperation,
C．Enjoying playing in the sea.
D．Being fond of traveling in large groups.
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