[单项选择]Where have Peter and Lucy gone
A. Australia.
B. America.
C. England.

[单项选择]Where have Peter and Lucy gone
A. Australia.
B. America.
C. Englan

[单项选择]
Scientists who study insects have a real mystery on their hands. All across the country, honeybees are leaving their hives and never returning. Researchers call this phenomenon colony-collapse (瓦解) disorder. According to surveys of beekeepers (养蜂人) across the country, 25 to 40 percent of the honeybees in the United States have vanished from their hives (麻疹) since last fall. So far, no one can explain why.
Colony collapse is a serious concern because bees play an important role in the production of about one-third of the foods we eat. As they feed, honeybees spread pollen from flower to flower. Without this process, a plant can’t produce seeds or fruits.
Now, a group of scientists and beekeepers have teamed up to try to figure out what’s causing the alarming collapse of so many colonies. By sharing their expertise (专家的意见) in honeybee behavior, health, and nutrition, team members hope to find out what’
A. Honeybees are flying all across the country.
B. 25--40 percent of the honeybees in the US have died.
C. Honeybees are leaving their hives and do not return.
D. Honeybee hives are in disorder.

[单项选择]

 

In the 1980s, scientists around the world began to notice something strange: Frogs were disappearing. More recent research has shown that many kinds of amphibians (两栖动物) are declining or have become extinct. They have been around for a long time—over 350 million years. Why are they dying out now
Scientists are seriously concerned about this question. First of all, amphibians are an important source of scientific and medical knowledge. By studying amphibians, scientists have learned about new substances that could be very useful for treating human diseases. Further research could lead to many more discoveries, but that will be impossible if the amphibians disappear.
The most serious aspect of amphibian loss, however, goes beyond the amphibians themselves. Scientists are beginning to think about what amphibian decline means for the planet as a whole. If the
A. in any stream they can find
B. in places without UV light
C. only on sand
D. only in the right conditions

[单项选择]
Sixty years ago, a man named Kenneth Arnold saw something that people are still (51) today, something that changed popular culture for ever.
Flying his plane over mountains in the US state of Washington, he saw a line of strange objects, either crescent -shaped or disc-like, flying (52) the motion of a saucer skimming on water.
The media soon picked up on the story--the Flying Saucers were here! Was the earth being (53) by creatures from another planet Soon, so many sightings were made that the US military began to (54) . It called these strange objects UFOs Unidentified Flying Objects, and that is how they are (55) today.
Military investigations found no evidence of visitors from outer space. But that did not stop the true (56) . The military were (57) up, they said. Or (58) it was because the travelers from space were of
A. named
B. called
C. known
D. dubbed