and break fewer branches, and thus maintain what little food sources are available.
Yong elephants may even eat the dung（粪便）of the female leader of a group when
facing food shortage.
During drought they are unlikely to give birth to their young but with good rains
the birthrate will increase greatly. Desert elephants have sand baths, sometimes
adding their own urine(尿液) to make them muddy!
As we continue to overheat our weak planet, it can only be hoped that other
animal species will adapt as extraordinarily well to change as the desert elephant.
46．
A．rarely ruin trees B．drink only every 3-4 days
C．search for food in large groups D．protect food sources for their young
47．
A．stories and explanation B．facts and descriptions
C．examples and conclusion D．evidence and argument
48．What can be inferred from the last sentence in the passage?
A．Overheating the earth can be stopped．
B．Not all animal species are so adaptable.
C．The planet will become hotter and hotter.
D．Not all animals are as smart as desert elephants.
B
Social networking isn’t only for the under 40s. More than 25 percent of
Americans 50 years and older stay connected using sites such as Facebook, MySpace
and Twitter, according to new research.
“The latest data tells us that more and more social networking is becoming a part
of everyday life for Americans 50 plus,” said Kevin Donnellan, the chief
communications officer at AARP, which released the report.
Nearly a quarter of older Americans are on Facebook and 73 percent said they
use it to stay in touch with relatives, but not just their children and grandchildren.
“They are using the Internet to keep up with the world and the people who are
important to them,” said Jean Koppen, the author of the report. She added that older
adults are also on Facebook to stay connected, not only with their family, but with
their friends and those in the same age group. Almost 50 percent of older adults
were introduced to the social networking sites by a family member, mainly a child or
grandchild. “Just under one-fifth of adults aged 50 and older say they do not use the
Internet,” according to the report.
The findings are based on a telephone survey of 1,863 adults. In addition to
keeping up on Facebook and Twitter older adults are aware of the latest technology.
Eighty-three percent had heard about the Apple iPad and 11 percent intended to buy