单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．They will leave as soon as the course is over.
B．They will leave on the 13th.
C．They will leave on the 14th.
D．They will leave on Monday—the 15th.
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单项选择题
A．Supporting the soil.B．Providing shade for animals.C．Loosening soil structure.D．Protecting the soil from wind and rain damage.
A．Supporting the soil.
B．Providing shade for animals.
C．Loosening soil structure.
D．Protecting the soil from wind and rain damage.
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