单项选择题

A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
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单项选择题
A．The nettle is widely used in the twine industry today.B．The nettle’s stinging hairs are a protective device.C．American Indians found many uses for the nettle.D．The slender nettle is found over a wide area of China.
A．The nettle is widely used in the twine industry today.
B．The nettle’s stinging hairs are a protective device.
C．American Indians found many uses for the nettle.
D．The slender nettle is found over a wide area of China.
单项选择题
A．When hunting for food.B．When sleeping.C．When being attacked.D．When communicating with their cousins.
A．When hunting for food.
B．When sleeping.
C．When being attacked.
D．When communicating with their cousins.
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