单项选择题

Among "humanity's current problems", the chief concern of the scientists is______.

A．the impoverishment of developing countries
B．the explosion of the human population
C．the reduction of biological diversity
D．the effect of global warming
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单项选择题
According to the passage, the preservation of rain forests______.
A．may hamper developing country in its fight against poverty
B．benefits developed countries rather than developing countries
C．should take priority over the control of human population
D．will help improve the living conditions in developing countries
单项选择题
Many commercials begin with a cheerful song of some kind because______.
A．pop songs attract viewer attention
B．it can increase their loudness
C．advertisers want to make them sound different from regular programs
D．unlike regular programs their intensity of sound varies over a wide range
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