单项选择题

Questions 23-26

A．Straw is an unlikely material for building.
B．In securing foundations, metal pins are more sustainable than wooden ones.
C．Dried stalks of wheat or barley can also be used in making good walls.
D．Bales of straw can be used as bricks in construction work.
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单项选择题
A．An occupation.B．A hobby.C．A sport.D．A pastime.
A．An occupation.
B．A hobby.
C．A sport.
D．A pastime.
单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
A．prevent the sun’s rays from reaching the earth’s surface
B．mean a warming up in the Arctic
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth’s surface
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