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单项选择题

What kind of book has Robert recently read

A．A book on environmental pollution.
B．A book on curing certain diseases.
C．A book on killing bacteria.
D．A book on the future of the world.
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单项选择题What does one out of seven in Paragraph 3 refers to

A．The percentage of the earth"s land that is desert-like.
B．More than a third of the land"s earth.
C．The number of people who live in dry regions.
D．One of the seven continents in the world.

单项选择题What is the possible relationship of these two speakers

A．Doctor and patient.
B．Teacher and student.
C．Two friends.
D．Two scientists.