单项选择题

A．To attract more students.
B．To make the courses suitable for students of all levels.
C．To let the students have a good rest.
D．To make the summer school more like a holiday.
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A．Look for the key.B．Repair the car.C．Fix a shelf.D．Paint a shelf.
A．Look for the key.
B．Repair the car.
C．Fix a shelf.
D．Paint a shelf.
单项选择题
A．Chemicals.B．Vapor.C．Water.D．Gas.
A．Chemicals.
B．Vapor.
C．Water.
D．Gas.
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