单项选择题

The word "bug" used in Paragraph 5 means ______.

A．a bacterium
B．a cold
C．a flu
D．a virus
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单项选择题
According to the author, if you want to keep healthy, you had better ______.
A．make the room dry
B．keep the food in the refrigerator
C．wash your hands as much as possible
D．clean the surfaces with anti-bacterial products
单项选择题
The passage tells us that researchers wish that they could find out ______.
A．when and where the veterans received the nuclear radiation
B．why the amount of radiation cannot be accurately measured
C．who was responsible for the veterans' deaths
D．how much radiation each veteran got during the nuclear tests
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