听力原文：Well, temperatures are finally staffing to fall in north America with pinches of

听力原文： Well, temperatures are finally staffing to fall in north America with pinches of snow already on the ground in some northern regions of the country. Even so the memory of this past summer's breaking heat and draught are still with most of people.

As our fears that the long predicted greenhouse effect of increased global temperatures and attendant problems may have actually begun. But of course one summer heat wave is not a trend make. Exports at NASA are compiling statistics of summers past and present in order to hatter document the changes, which may or may not be occurring. Some scientists hypothesize that warming trend does exist based on data gathered to variety of methods over the last 100 years.

NASA's chief scientist for global change promotes the study of this phenomenon on the international scale using satellite data and help from other countries to gain a worldwide perspective on the greenhouse effect.

(26)

A．North America.

B．Most places of the regions of this country.

C．Some places of the most northern regions of the U.S.A.

D．The most northern regions of North America.