閱讀理解

In Picture 1, it tells us what happens, how much time it takes to dissolve (溶解)the sugar when tem-perature increases．In Picture 2, it's a room．The heater is working all the time．Can you get any knowledge of how the convection current (對流)is born?

根據(jù)圖示信息選擇最佳答案．

(1)

When the temperature of water is ________, it takes the least time for the sugar to dissolve．

[　　]

A．

50℃

B．

40℃

C．

60℃

(2)

When the wind blows, what happens?

[　　]

A．

Cool air rises．

B．

Warm air falls．

C．

Warm air rises and cool air takes the place of warm air．

(3)

Which of the following is NOT true?

[　　]

A．

From the picture, we can know air can move like liquid．

B．

When air is heated, warm air goes down and cold air rises．

C．

When air is heated, warm air goes up and cold air falls．

(4)

When the temperature of water is 40℃, ________ is needed to dissolve the sugar．

[　　]

A．

40 seconds

B．

23 seconds

C．

15 seconds

(5)

We know that ________ from Picture 1．

[　　]

A．

when the temperature of water is low, it takes the least time to dissolve the sugar．

B．

when the temperature of water is high, it takes the least time to dissolve the sugar．

C．

the temperature of water has no influence(影響)on how soon the sugar dissolves．

答案：1．C;2．C;3．B;4．C;5．B;
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