单项选择题

Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．A controlled study.
B．A trial study.
C．An observational study.
D．A successful study.
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consciousness
单项选择题
A．Work in this area is easy and relaxing.B．There are too many criminals and the work is challenging.C．The job is challenging and the pay is high.D．It is easy for him to find job after graduation.
A．Work in this area is easy and relaxing.
B．There are too many criminals and the work is challenging.
C．The job is challenging and the pay is high.
D．It is easy for him to find job after graduation.
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