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________ environmental damage is done, it takes many years for the ecosystem(生態(tài)系統(tǒng))to recover．

[　　]
A．

Even if

B．

If only

C．

While

D．

Once

答案：D
解析：

even if引導(dǎo)讓步狀語(yǔ)從句，意為“即使”；if only后面的從句中要用虛擬語(yǔ)氣，表示“要是……該多好啊”；while引導(dǎo)時(shí)間狀語(yǔ)從句，意為“當(dāng)……的時(shí)候”；once引導(dǎo)時(shí)間狀語(yǔ)從句，表示“一旦……就……”。本句的句意為“一旦環(huán)境損害造成，生態(tài)系統(tǒng)要經(jīng)過許多年才能恢復(fù)”。本題的答案為D項(xiàng)。


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科目：高中英語(yǔ) 來源：101網(wǎng)校同步練習(xí)　高二英語(yǔ)　人教社(新課標(biāo)B　2004年初審?fù)ㄟ^) 人教實(shí)驗(yàn)版 題型：050

　　It’s not the flashiest car in the world．Not even close．But the 1971 Volkswagen named Helios can do something most cars can’t ：run on solar energy－energy from the sun’s light and head!

　　Joshua Bechtold, 14,and the other students at the Riverside School in Lyndonville, Vermont, worked many months to get Helios ready．They named their car after Helios, the sun god in Greek mythology(神話)．

　　The 4-year-old Tour de Sol encourages the use of “green”, or environmen-tally friendly, cars to help reduce pollution and save energy．It’s not a race．Cars are judged on fuel efficiency(耗油量)rather than speed．In the week-long event, 44 cars took the 350-mile tour from Waterbury, Connecticut, to Lake George, New York．Of the 23 student cars, Helios was the only one built by middle school students．

　　A teacher drove Helios, but the children talked with people wherever they stopped along the road．“That was my favorite part,” says Anna Browne,15．“We explained how the car runs．”

　　Due in part to old, inefficient batteries(電池)，Helios finished fourth－out of four－in its kind, the sun-powered class．“We were there for the fun of it,” Anna says, “We’re proud of Helios,”says Ariel Gleicher, 14．“It’s a car that’s good for the environment．”

(1)

What is special about the car Helios in the text?

[　　]

A．

It was built by middle school students．

B．

It has an attractive design．

C．

It was made in 1971．

D．

It won the fourth prize．

(2)

How many sun-powered cars took part in the race?

[　　]

A．

1

B．

4

C．

23

D．

44

(3)

What would be the best title for the text?

[　　]

A．

The Making of Helios．

B．

1999 American Tour de Sol．

C．

Sun-powered Gars on the Road．

D．

Use of Green Cars in Connecticut．

(4)

The students felt proud of Helios because ________．

[　　]

A．

it could run as far as 350 miles

B．

it was favored by many children

C．

it had high-quality batteries

D．

it was driven by clean energy

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