单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Take the medicine as she was directed to do.
B．Schedule another appointment with her doctor.
C．Stop taking the medicine.
D．Rest her back for a few days.

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Why can astronomers age galaxies by computing how much the wavelength of their light has stretched

单项选择题

A．Building relationship with outer space,B．Making profits.C．Creating a stepping-stone to scientific research.D．Fostering international scientific cooperation.

A．Building relationship with outer space,
B．Making profits.
C．Creating a stepping-stone to scientific research.
D．Fostering international scientific cooperation.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 11 to 18 are based on the conversation you have just heard.