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填空题

【参考答案】

改“suffered”为“suffering”
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单项选择题The multi-tube boiler system made the Rocket, Robert’s locomotive,______.

A．powerful
B．achieve a speed of 30 miles an hour
C．acquire 25 little tubes
D．good for hauling trains

单项选择题The phrase impinge on most probably means ______.

A．promote
B．rely on
C．have an impact on
D．block

单项选择题Robots will not be accepted unless ______.

A．they can do some domestic jobs in hospital
B．they can cook and package food
C．they can greet people at the counter
D．they can do jobs human needs to solve a shortage of labourers

填空题在safest前加定冠词“the”

填空题改“medicines”为“medicine”