单项选择题

提高氢气分压的措施为？
A、提高系统压力，提高氢气浓度
B、降低系统压力，提高氢气浓度
C、提高系统压力，降低氢气浓度
D、降低系统压力，降低氢气浓度

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单项选择题

体育人口是具有统计意义的社会群体。（）
A、正确
B、错误

多项选择题

What are some of the purposes of transition devices? ( ) A. focus attention on the main meaning of the text B. be able to simplify sophisticated input C. involve all the students in clearly defined reading tasks D. when transition device is completed, use it as a basis for further oral or written language practice.