单项选择题

Where is the noise pollution most serious according to the passage（）

A．In streets.
B．In airports.
C．In subway stations.
D．In concerts.

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热门试题

单项选择题

Which sound can most people's ears pick up（）

A．Sounds of 15,000 hertz.
B．Sounds of 20,200 hertz.
C．Sounds of 30,000 hertz.
D．Sounds of 50,000 hertz.

单项选择题

When customers enter the store in the USA, they will （）

A．see store clerks sitting around watching TV
B．receive warm greetings from clerks
C．show their respects to clerks
D．be given a pamphlet introducing the goods