单选题 The Intergovernmental Panel on Climate Change (IPCC) was set up in 1988 to assess information on climate change and its influence. Many hundreds of scientists from many countries participated in its preparation and review. Incorporating new results from the past five years of research on climate change, its third report in 2004 predicted global temperature rises by 2100 of between 1.4℃ and 5.8℃compared to a previous assessment of 1.0 to 3.5℃ for the same period. Although the issue of the changing climate is very complex and some changes are uncertain, temperature rises are expected to affect countries throughout the world and have a severe effect on sea- level rises.
Scientists have argued about whether temperature rises are due to human activities or due to natural changes in our environment. Some have believed that the emission of industrial and life wastes turns to warm the surface, while the others have insisted that natural factors, such as changes in solar output or explosive volcanic activity can also be criminal in this case.
The IPCC announced in 2001 that "most of the warming observed over the last 50 years is likely to be owing to human activities". This was a more forceful statement than in 1996 when the second report stated that there was a "definite human influence on the climate" which was the first time they had concluded such a link. Many experts believe the faster the climate changes, the greater the risk will be.
Key points of the predictions for climate change globally include that by the second half of the 21st century, wintertime rainfall in the northern areas will rise, that at the same time Australia, Central America and southern Africa are likely to see decreases in autumn rainfall, that some land areas in the tropics will see more rainfall, and that there will generally be more hot days over land areas.
The IPCC also warned that global surface temperature increases and rising sea level are predicted to continue for hundreds of years after stabilization of greenhouse gas concentrations, owing to the long timescales on which the deep ocean adjusts to climate change. Therefore, further research is required to improve the ability to detect, attribute and understand climate change, to reduce uncertainties and to project future climate changes.

单选题 According to the passage, a Chinese city that recorded 45℃ at noon on August 4, 2004, will probably witness a temperature of ______ at 12:00 sharp in the year of 2100.
[A] 46.1℃ [B] 1.4℃
[C] 5.8℃ [D] a number that I do not know

单选题 According to the author, climate researchers ______.
[A] are quite sure about why it's getting hotter and hotter
[B] declare that we humans are the cause why it's getting hotter
[C] have discussed the possible causes why it's hotter
[D] have claimed that changes in nature are the roots of hot days.

单选题 The IPCC announcement that most of the warming observed over the last 50 years is ______.
[A] possibly due to human activities
[B] the first link between warming and human
[C] due to explosive volcanic activity
[D] partly due to human activities

单选题 "Such a link" in the passage refers probably to ______.
[A] IPCC and climate changes
[B] global temperatures and sea levels
[C] natural changes and human activities
[D] human activities and temperature rises

单选题 Obviously, the word "project" in the last paragraph most probably refers to ______.
[A] predict [B] report
[C] reduce [D] stabilize