单项选择题

A．To make the railway operation safer.
B．To offer passengers more comfortable journeys.
C．To meet the demand of shipping larger loads.
D．To connect the railway network with the highways.
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单项选择题
A．He advises students participating in a special program. B．He teaches part-time in an elementary school. C．He observes elementary school students in the classroom. D．He helps students prepare their resumes.
A．He advises students participating in a special program.
B．He teaches part-time in an elementary school.
C．He observes elementary school students in the classroom.
D．He helps students prepare their resumes.
单项选择题
A．She has never seen snow before. B．She is conducting a research on snow. C．She wants to make artificial snow. D．She has just read about snowflakes.
A．She has never seen snow before.
B．She is conducting a research on snow.
C．She wants to make artificial snow.
D．She has just read about snowflakes.
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