单项选择题

The attitude of the author towards the research project is

A．positive.
B．negative.
C．suspicious.
D．indifferent.
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单项选择题
Which of the following is NOT mentioned as a cause of the problem discussed in the passage
A．Natural barriers to sea water have been destroyed,
B．The water table has gone down after droughts.
C．Sea level has been continuously rising.
D．Evaporation of water leaves salt behind.
单项选择题
Which country is the largest coffee producer
A．Brazil.
B．Colombia.
C．Ethiopia.
D．Egypt.
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