单项选择题


Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．60% of its population.
B．70% of its population.
C．30% of its population.
D．40% of its population.
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单项选择题
A．Materials that are easy to shape.B．The bones of men who made tools.C．Stones that do not decay.D．Ancient tools made from stone.
A．Materials that are easy to shape.
B．The bones of men who made tools.
C．Stones that do not decay.
D．Ancient tools made from stone.
单项选择题
A．Because cannabis proved to be more harmful than tobacco.B．Because canabis is already so widespread.C．Because it is not known whether cannabis may be harmful or not.D．Because canabis is proved to be positively harmful.
A．Because cannabis proved to be more harmful than tobacco.
B．Because canabis is already so widespread.
C．Because it is not known whether cannabis may be harmful or not.
D．Because canabis is proved to be positively harmful.
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