单项选择题

How does the disease mentioned in the passage spread（）

A．Through food.
B．Through air
C．Through insects.
D．Through body fluids.

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单项选择题
What were lord and Lady Chestfield doing when the thieves broke into their house（）

A．They were drawing pictures.
B．They were watching TV.
C．They were making a telephone call.
D．They were tidying up the drawing room.
单项选择题
What is the purpose of analyzing the speed of sound through the Pacific-Ocean（）

A．To determine whether the Earth’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depths of the ocean.
D．To measure the movement of waves on the ocean.
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