单项选择题

Who will be most probably interested in Discovery

A．Parents who want to send their children to a school of medicine.
B．Children who are good at mathematics.
C．Parents who want their children to become another Albert Einstein.
D．Children who are interested in playing chess.

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单项选择题

In Science Health, Johns Hopking is.

A．a famous university
B．a medical centre
C．well-known doctor
D．a drug company

单项选择题

Which of the following gives a general idea of how the noise killing system works

A．By producing pressure waves going in the opposite direction.
B．By mixing high frequency sound waves with low frequency sound waves.
C．By mixing new sound waves with the noise and sending them out together.
D．By making copies of the unwanted sound waves and letting them out a little later.