单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20. What is dry ice made of

A．Chemicals.
B．Vapour.
C．Water.
D．Gas.
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单项选择题
What kind of courses do summer schools offer
A．Courses in British history.
B．Language courses.
C．Courses in sports.
D．Teacher training courses.
单项选择题
A．butB．exceptC．withD．besides
A．but
B．except
C．with
D．besides
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