单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．To cheek the accuracy of scales.
B．To see the quality of other metals.
C．To measure changes in the air.
D．To measure the length of metal.
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单项选择题
A．He would have been on a field trip.B．He would have been swimming and enjoying the sunshine.C．He would have been studying most of the time.D．He would have been staying in the house.
A．He would have been on a field trip.
B．He would have been swimming and enjoying the sunshine.
C．He would have been studying most of the time.
D．He would have been staying in the house.
单项选择题
A．Because small earplugs are less effective in music transmission.B．Because small earplugs are provided by most music players.C．Because large earphones may better block off outside noise.D．Because large earphones may offer a louder music sound.
A．Because small earplugs are less effective in music transmission.
B．Because small earplugs are provided by most music players.
C．Because large earphones may better block off outside noise.
D．Because large earphones may offer a louder music sound.
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