单项选择题

A．A researcher.
B．A college professor.
C．A technician.
D．A writer.
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单项选择题
The author was most probably a tenant of the family.
A．Y
B．N
C．NG
单项选择题
A．Only half the world’’s water can be used.B．The world population is increasing faster and faster.C．Half of the world’’s water resources have been seriously polluted.D．Humanity has not placed sufficient value on water resources.
A．Only half the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed sufficient value on water resources.
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