问题 选择题

人工授粉的好处是(  )

A.加速果实成熟

B.加速果实发育

C.防止品种变异

D.增加产量

答案

高等植物只有在传粉和受精作用之后才能结出果实,自然状态下,由于各种客观原因会引起授粉不足,这样果实的籽粒就会减少,为提高农作物的产量,实践中常采用人工授粉的方法来弥补自然状态下的传粉不足.

故选:D

阅读理解

Imagine one day the water taps (水龙头) in your house stop running. You have to pay a lot of money to buy water from shops. And still there isn’t enough water for everyone. Your mother has to save the family’s shower water to use for washing clothes. Would you be able to stand that kind of life?

Probably not. But that is what kids in Yemen (也门) are experiencing (经历). According to a report, the capital, Sana, will run out of drinking water as early as 2025.

Because of the water shortage (短缺), the Yemen government often cuts the water supply (供应). Hannan, an 18-year-girl, tells the Teens, “In a good week we’ll have a water supply all week. But then the next week there will be water only for a day or two.”

Hannan says only rich people have enough water to use. They can buy water from the shops or from the water trucks. Private (私人的) companies own the trucks, They travel around the city every day to sell water--- at very high prices.

“ A lot of people can’t pay for it,” she says.

The government is thinking of making use of seawater. But it will cost a lot and it may not happen soon enough to help the people of Yemen.

小题1:How old is Hannan?     

A.She is eight.

B.She is eighteen.

C.She is seventeen.

D.She is seven.小题2:The underlined word “that” means_______.

A.buying water from shops

B.having enough drinking water

C.suffering(忍受) from water shortage

D.washing clothes with used water小题3:From the passage, we know that ______.

A.the people of Yemen don’t have to worry about water

B.people in Yemen have no water to use during a bad week

C.Sanna will have no drinking water in 10 years

D.private companies make much money by selling water小题4:The Yemen government ______.

A.may try to make use of seawater

B.does nothing about the water problem

C.only cares about rich people’s lives

D.may solve the problem soon小题5:The writer wants to tell us ______.

A.not to use seawater

B.not to waste water

C.to drink less water

D.to sell water to Yemen

单项选择题