单项选择题
Which counties spent billions of dollars to develop new oil fields
A．Syria, Brazil and Russia.
B．Brazil,Iran and Saudi Arabia .
C．Saudi Arabie ,Brazil and Russia.
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单项选择题
How does rotational grazing reduce the need for pesticide treatments
A．By increasing the use of natural fertilizer.
B．By limiting the need for chemical fertilizers.
C．By reducing the growth of weeds.
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单项选择题
Which news agency votes for the top ten news stories
A．Reuters.
B．The Associated Press
C．United Press International.
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