单项选择题

What do the two speakers probably do for a living.

A．Office clerks.
B．Printers.
C．Archiects.
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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.
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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