单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．A more economical diesel run.
B．Characteristics of a new type of run.
C．Where a new energy source is located.
D．How to develop alternative energy sources.
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单项选择题
A．Because they need more protein than vegetables supply.B．Because they cannot digest vegetables.C．Because they use more energy than adults.D．Because they cannot easily digest milk and milk products.
A．Because they need more protein than vegetables supply.
B．Because they cannot digest vegetables.
C．Because they use more energy than adults.
D．Because they cannot easily digest milk and milk products.
单项选择题
A．In the side street.B．At the crossroads.C．On the main road.D．On the motorway.
A．In the side street.
B．At the crossroads.
C．On the main road.
D．On the motorway.
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