单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．There is a greater demand of clean water.
B．More water sources are polluted or disappearing.
C．Developed countries consume too much water.
D．More water is ruined and developed countries consume too much.
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单项选择题
A．Because farmers use less insecticides now.B．Because farmers have been using insecticides for many years.C．Because insects use the mechanisms against plants to fight insecticides.D．Because insects have been eating plants for many million years.
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects use the mechanisms against plants to fight insecticides.
D．Because insects have been eating plants for many million years.
单项选择题
A．A boom period of photography.B．The official date of the peak of photography.C．The official date of the beginning of photography.D．A meaningless year of photography.
A．A boom period of photography.
B．The official date of the peak of photography.
C．The official date of the beginning of photography.
D．A meaningless year of photography.
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