单项选择题

In this section, you will hear several news items. Listen to them carefully and then answer the questions that follow.

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now, listen to the news.
What was the cause of the explosion

A．Children playing with fire.
B．Fireworks set off in a house with explosives.
C．Sparks from a fireworks display falling on the warehouse.
D．The firing of a gun.

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单项选择题

What causes the prices of the telephone system to lower in America

A．The material became cheaper.
B．There was more competition.
C．More people used the phones.
D．The phones were connected across the sea.

单项选择题

Why don’t all ice crystals in clouds immediately fall to Earth

A．They are balanced by the pressure of rain droplets.
B．The effect of gravity at high altitude is random.
C．They are kept in the sky by air current.
D．They are moving about with fixed direction.