单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．How the dentists help patients relax.
B．What colors to use in painting walls in a hospital.
C．Seeing a dentist could be a less painful experience.
D．Trust and understanding of dentists help reduce patients’anxiety and tension.

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单项选择题

What is the passage mainly about

A．The scientific revolution in the seventeenth century.
B．Reasons that chemistry developed slowly as a science.
C．The practical aspects of chemistry.
D．Difficulties of organizing knowledge systematically.

Passage TwoQuestions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Passage Two
Questions 30 to 32 are based on the passage you have just heard.