题目内容

【题目】—Is Peter coming?

—No, he____ his mind after a phone call at the last minute.

A. changes B. changed

C. was changing D. had changed

【答案】B

【解析】

试题分析：句意：彼得来了吗？没有，刚才接到一个电话后改变主意了。根据at the last minute在最后一秒可能发生在过去，故用一般过去时

练习册系列答案
相关题目

【题目】I can't find the recorder in the room. It________by somebody.

A．may have been taken away

B．may leave

C．may take away

D．must have taken away

【题目】Like ancient sailors, birds can find their way _______the sun and the stars.

A. used B. having used

C. using D. use

【题目】____ in the poorest area of Glasgow, he had a long, hard road to becoming a football star.

A. Being raised B. Raising

C. Raised D. To raise

【题目】Printing passengers’ names and ID numbers on tickets will make harder to protect their private information.

A. one B. those C. it D. them

【题目】 The Bialowieza Forest, which grows along the border of Poland and Belarus(白罗斯), is all that remains of the primeval(原始的) forest which once covered Europe. A World Heritage site since 1979, the forest covers an area of 550 square miles. Wolves prowl(潜行) beneath the ancient trees. Running closer to the ground are least weasels(伶鼬). They come in two types. One wears a brown coat all year. The other sheds its brown coat each autumn and turns bright white. It is believed to be an adaptation to help it blend in with snow.

However, there was no snow cover when biologist Karol Zub, at the Polish Academy of Sciences, observed an entirely white weasel hunting rodents(啮齿动物). 【1】 “At this very moment, I thought to myself. Wowl if this animal is so well visible, it must be a perfect target for predators,” Zub said.

His instincts were right 【2】 Zub and his colleagues analyzed weather data in the Bialowieza Forest going back to 1967. The average period with permanent snow cover decreased from about 80 days per year to 40 days. Historically, the snow cover disappears around Mar. 15. But in recent years, it disappeared by Feb. 21, more than three weeks earlier in the season. And there are fewer white weasels are about four to five times lower than then years ago.

As the number of days without permanent snow cover increased, the proportion of white weasels dropped dramatically. This crop is a case of what wildlife biologists call “camouflage(伪装) mismatch.” 【3】 Camouflage mismatch may cause the local extinction of white weasels, or at least a severe reduction in population.

【4】 Those who blend in live longer. Individuals who clash with their environment get eaten. There are 21 species known to change the color of their coats in winter. Zub predicts the other coat-changers are faring(遭遇) as badly as the humble weasel.

Life on Earth is reacting to climate change. Bears appear to be hibernating for fewer days. Tropical fish are swimming away from the equator in search of cooler waters. Some animals have moved up into the mountains to escape increased temperatures. But camouflage mismatch might be one of the worst effects. After all, it’s hard not to notice a flash of white fur in a dark forest.

【题目】 Rankings have become an inescapable part of the reputation of universities, _________them to attract students, staff and research investment.

A. to help B. helped C. helping D. help

【题目】I heard the voices, but I couldn’t _______ what they were saying.

A. look out B. cut out

C. leave out D. make out

【题目】

【1】If you want to take an underground journey, which place is the best choice?

A.Poole's Caven.B.Pavilion Gardens.

C.Buxton Museum.D.Green Man Gallery.

【2】Buxton Open House & Pavilion Arts Centre is special because it offers ________.

A.rides in small trains

B.courses in modcm arts

C.artistic and cultural activities

D.basic courses in horse riding

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网