单项选择题

A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Boss and secretary.
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单项选择题
A．Flaxoc has focused its manufacturing facilities only in Europe.B．Flaxco has concentrated its resources and effort on medicines of the highest quality.C．Flaxco is expanding its basic research activity in the USA as well as in Italy.D．Flaxco’s biggest research effort by far is in the UK.
A．Flaxoc has focused its manufacturing facilities only in Europe.
B．Flaxco has concentrated its resources and effort on medicines of the highest quality.
C．Flaxco is expanding its basic research activity in the USA as well as in Italy.
D．Flaxco’s biggest research effort by far is in the UK.
填空题
According to animal-behavior experts, the pets can be conditioned through______.
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