B.looked back
C.to look back
D.when looked back
答案:A 考查非谓语动词。and连接的是he owed his success to the support of his friends,因此选looking back表时间。句意:公司经营得很好,回首过去,他把它归功于朋友的支持。
.阅读理解
A
(2010·鄂州市高三摸底考试)
“Around 500,000 years ago, at the Peking Man Site at Zhoukoudian in Beijing's suburban Fangshan district, which is about 50 km from the city of Beijing, there lived early human beings,” says a China history textbook.
The textbook now has to be revised. New dating techniques suggest the remains of Peking Man—found in the 1920s—are over 200,000 years older than previously thought. What's important about that date, about 770,000 years ago, is that this was an ice age on Earth.
Over Earth's long history, there have been a number of times when ice and snow covered a large part of its surface. Such periods are known as ice ages.
Earth is in an ice age now. It started about 2 million years ago. Despite the many warm periods since then, scientists regard the whole time as one ice age because of the continuous existence of at least one large ice sheet—the one over Antarctica.
The new discovery was made by Chinese and US scientists. It suggests Peking Man is probably our oldest cold weather human being, said Darryl Granger, an atmospheric scientist at Purdue University whose research appears in Thursday's edition of the journal Nature.
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