单项选择题

According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.
A) one hour C) two hours
B) half an hour D) three hours

A．According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.
B．one hour
C．half an hour
D．two hours
E．three hours
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单项选择题
The government is introducing new production management standards for the food industry.
A．政府正在为食品行业制定新的生产管理标准。
B．政府正在为食品行业介绍新的生产管理标准。
C．政府正在介绍食品行业的新的生产管理标准。
D．政府正在引进新的代表食品行业的生产管理标准。
单项选择题
By the time this talk is over, we ______ a lot about the earth. A) shall be learning C) would learn B) are learning D) shall have learnt
A．By the time this talk is over, we ______ a lot about the earth.
B．shall be learning
C．are learning
D．would learn
E．shall have learnt
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