单项选择题

To make cars, Henry first of all needed ______.

A．his wife’s encouragement
B．a lot of money to buy equipment
C．engineers and technicians
D．to produce a gasoline engine that would be the power for his car

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热门试题

单项选择题

Greenhouse effect means ______.

A．the way in which gases are used for keeping plants warm
B．a natural course which is to some degree helpful to us
C．the way" greenhouse gases trap heat on the earth
D．the whole course in which greenhouse gases prevent heat

单项选择题

If there were no greenhouse effect, ______.

A．no plants would grow on our planet
B．earth would be thirty degrees colder
C．man could not live on the earth
D．all of the above answers are correct