单项选择题

A．Fuel-efficient cars.
B．Air pollution caused by cars.
C．History of Automobile developments.
D．Electric-powered cars.
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单项选择题
A．Speak very slowly but loudly.B．Ask questions frequently.C．Vary pitch, volume and speed of speech.D．Keep the speech clear and concise.
A．Speak very slowly but loudly.
B．Ask questions frequently.
C．Vary pitch, volume and speed of speech.
D．Keep the speech clear and concise.
单项选择题
A．A comparison of fish as a cold-blooded animal with warm-blooded animals.B．The difference between water animals and land animals.C．The importance of fish to human beings.D．How water has affected the development of fish.
A．A comparison of fish as a cold-blooded animal with warm-blooded animals.
B．The difference between water animals and land animals.
C．The importance of fish to human beings.
D．How water has affected the development of fish.
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