What can we learn about Lance Armstrong?
A．He is an official in the U. S. Anti-Doping Agency.
B．He is a cyclist who suffered from certain cancer.
C．He is a French athlete competing in Tour de France.
D．He is a famous movie superstar.

未分类题What is the possible result of Armstrongs dropping his fight?A．Being deprived of his titles.B．Being imprisoned.C．Falling into more charges.D．Being oppressed by the constitution.

未分类题What makes the U. S. fight the charges against a beloved superstar?A．Their love for the international athletic glory.B．Their own ranks.C．America's credit.D．The spirit of fair play.

未分类题The attitude of the author toward the new service is

未分类题What are the ideal conditions for creating clouds?A．The temperature is as low as minus 235 degrees Fahrenheit.B．The air is a million times drier than that of Sahara.C．Extremely dry air and low enough temperature.D．A mild climate and the build-up of carbon dioxide.

未分类题Which of the following statements is true?A．In the upper atmosphere, carbon dioxide acts as a thick, heat-trapping blanket.B．It is the build-up of CO2 that causes climate change and heats up Earth's surface.C．Yearly emissions of carbon dioxide levels have grown about 20 percent since 1980.D．The build-up of carbon dioxide leads to the surge of night-shining clouds.