单项选择题

The cells of your body develop supplies of energy（）

A．when you are asleep
B．when you recover from your work of the day
C．in the next period of activity
D．when you are quiet

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单项选择题

If you don't have as much sleep as your body needs, you will （）

A．work properly
B．think clearly
C．keep your attention on your work
D．easily get angry

单项选择题

According to the passage, which of the following is true（）

A．Spiders were the first life that could live on the island.
B．The island is far away from any piece of land.
C．Insects could not live on the island without plants.
D．Plants were brought to the island by human beings.