A．10,000 pounds.
B．1,000 pounds.
C．100,000 pounds.
D．100 pounds.

Which of the following is NOT mentioned as the reason for scammers to go after home computers？
A．Because of the data that contain credit card information.
B．Because of the data that contain social security numbers.
C．Because of the machines that control the high speed linkds which in mm can be used for spamming, and fraud.
D．Because of less protection of home computers.

Which of the following suggestions are not implied in the passage？
A．Develop internet streetsmarts.
B．Be skeptical of anyone online who asks to divulge confidential information.
C．Higher levels of security protection.
D．Do not use instant messaging and phone calls online.

听力原文：The complex vocalizations of songbirds are learned, not inherited.Some even have regional accents. Wrens, thrushes and other songbirds don't hatch with their impressive musical talents. They learn to sing their extensive repertoires by listening to others of their kind.Donald Kroodsma is the author of a new book, The Singing Life of Birds. Kroodsma says many birds seem to come naturally equipped with basic sounds and even some very simple songs. The eastern wood-pewee is an example. "We've done some experiments showing that those songs are pretty much encoded in the DNA.But as a result, it's a pretty limited repertoire of, oh, in the eastern wood peewee, of up to three different songs. But all the songbirds, when we think of songbirds, we think of wrens and warblers, robins, thrushes, sparrows, all the birds that make so much racket, these are the songbirds that have very special groups of neurons in the brain, and most of them imitate precise details of songs just like you and I learned our native language." Kroodsma says birds even share our tendency toward regional dialects. "When birds learn songs at a particular location and stay around at that location, regional dialects tend to develop. They have the same kind of dialects that develop in human speech." Kroodsma says he recently took a long bike trip, from the Atlantic Coast through Virginia, Kentucky and Illinois. He says the accents and dialects of both people and birds changed along the way.
How do songbirds learn their complex vocalizations？
A．They inherited by their parents.
B．They have this naturally encoded in their genes.
C．They learn by listening to others of their kind.
D．They learn by listening to other kinds of birds.

What is the audience told NOT to do？
A．Taking the photographs
B．Leaning out the window
C．Asking some questions
D．Opening the window

What is the size of Larsen B ice shelf before it disintegrated in the 1900s？
A．It covered more than 2,000 square kilemeters, and was 300 meters thick.
B．It covered more than 3,000 square kilemeters, and was 100 meters thick.
C．It covered more than 3,000 square kilemeters, and was 200 meters thick.
D．It covered more than 2,000 square kilemeters, and was 100 meters thick,