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B. many people have donated their extra computer power
C. most computers aren’t used when people are at home
D. IBM supplies it with advice and support
72. Which of the following statements is TRUE according to the passage?
A. There isn’t a regional limit for people to join the project.
B. Scientists at the University of Washington have benefited little from the project.
C. Many computers in the world aren’t active because people never use them.
D. Computers in most countries have participated in the project.
E难度：中
Rising temperatures could wipe out more than half of the earth’s species in the next few centuries, according to researchers who published a study on Wednesday linking climate change to past mass extinction (灭绝).
Researchers at the University of New York said their study was the first to examine the relationship between climate, extinction rates and biodiversity (生物多样性) over a long period. The findings suggest climate change was the cause of large-scale extinction, said Peter Mayhew, an ecologist who worked on the study.
The study analyzed fossil (化石) records and temperature changes over 500 million years, and found that three of the four biggest events of extinction — defined as when more than 50 percent of species disappeared — occurred during periods of high temperatures.
“The relationship is true for the whole period in general,” Mayhew said. “If temperatures went up, then the number of species in danger of extinction would go up and biodiversity would be lower.”
The research group of the United Nations predicts that average global temperatures are likely to rise by between 1.8 and 4 degrees Celsius (3.2 and 7.2 Fahrenheit) by the end of this century, partly as a result of greenhouse gas emissions.
The upper end of the forecast rise would heat the earth close to the temperatures of 250 million years ago, when 95 percent of all animal and plant species became extinct, Mayhew said.
Some of the past mass extinction happened over a brief few hundred years, providing evidence that present-day rapid temperature rises could have the same impact, Mayhew said. “It does give us an idea of what to expect in the near future,” he said. “There is nothing that says it couldn’t happen in a short timescale.”
73. What’s the passage mainly about?
A. The effects of global warming on the environment.
B. The connection between the climate and extinction of the earth’s species.
C. Fossil records and temperature changes over 500 million years.
D. The efforts of the world to rescue the earth’s species.
74. According to the study we learn that _________.
A. researchers could get information about extinction from fossil records
B. the four biggest events of extinction were all caused by high temperatures
C. researchers studied temperature changes of the past 500 years
D. global temperatures rise only due to greenhouse gas emissions
75. The underlined part “have the same impact” in Paragraph 8 means that _________.
A. temperatures on earth will go higher in the future
