单项选择题

A．To test the role of environment in the development of intelligence.
B．Because their parents were too poor to support them.
C．Bemuse their parents passed away.
D．To find out how well twins grow in separate homes.
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单项选择题
A．The repairman had finished cleaning the plugs.B．The repairman had just started working on her car.C．The repairman had lost the old plug.D．The repairman had changed the plug.
A．The repairman had finished cleaning the plugs.
B．The repairman had just started working on her car.
C．The repairman had lost the old plug.
D．The repairman had changed the plug.
单项选择题
A．To prevent the lookers-on from getting near.B．To protect the injured men.C．To let the fire engines and ambulances pass.D．To cheek the leaking gas pipe.
A．To prevent the lookers-on from getting near.
B．To protect the injured men.
C．To let the fire engines and ambulances pass.
D．To cheek the leaking gas pipe.
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