单项选择题

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.
Why are some children still backward in speaking

A．Their brains have been input with too much language at once.
B．They do not listen carefully to their mothers.
C．Their mothers are not intelligent enough to help them.
D．Their mothers do not respond to their attempts to speak.

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单项选择题

How many people were buried alive under the volcanic ash

A．About 18,000.
B．More than 2,000.
C．1,700.
D．A few.

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Where are Kate and David going

A．They are going to see film downtown.
B．They are going to call on the Johnsons.
C．They are packing and going on their holiday.
D．They are going to buy an umbrella since it is raining very hard.

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20. Why are some children still backward in speaking 您的浏览器不支持 audio 元素。

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.
Why are some children still backward in speaking