Question: Q: Read the following article and answer the question. Article: It takes two to duet  , and one question for scientists is how these coordinated   performances arise -- in birds. Are they the result of cooperation, a way in which one pair signals to others that they've got it together? Or are they the result of conflict, evolving to avoid one partner's song interfering with the other's? A study of duetting in Peruvian warbling antbirds  suggests that it might be a little of both, and that context is everything. Joseph A. Tobias and Nathalie Seddon of the University of Oxford show in Current Biology that sexual conflict can cause the female of a pair that normally cooperates to "jam" the male's song by singing over it. The researchers exposed antbird pairs to recorded songs of other antbirds and monitored the songs the pairs produced. In one experiment, they played the songs of an intruding pair. In this case, the resident pair "both are likely to lose their territory, so both should cooperate," Dr. Tobias said. And they do. They produce a coordinated duet that in effect tells the intruders to keep away. But when the researchers played the song of a single female, the pair behaved differently. "You'd expect the resident female to be highly motivated to defend her position in the partnership," Dr. Tobias said. And that's what occurs. The male sings its heart out, flirting  with the single female, and the female of the pair does its best to interfere with the song by singing over it, apparently to make her mate less attractive to the other female. "It's clear that the male doesn't like what she's doing," Dr. Tobias said. The behavior "breaks up what is otherwise a very cooperative situation into a more complicated signal," he added. It's the first evidence of this kind of signal jamming among pairs, Dr. Tobias said. And in that it leads the male to alter its song to avoid the female's interfering notes, it shows that this kind of conflict could, over a long period, drive the evolution of coordinated song. Question: How did the researchers conduct the experiment? Answer:

OPTIONS:
- They put the antbird pairs back to nature and observe them.
- They played different recorded songs of other antbirds.
- They put an antbird to the other's territory and observed.
- They played the songs of an intruding pair.

A: They played different recorded songs of other antbirds.


Q: Read the following article and answer the question. Article: What will you be doing when you are 26 years old? Studying at university or working for a living? Take a look at what Albert Einstein was doing at the age of 26. 100 years ago, Einstein was working in Switzerland. His hobby was physics. Without much money or help, he wrote five papers  for a physics magazine. Three of these greatly changed the study of physics and our understanding of space, time, light and matter . His most famous work is on the Theory of Relativity . Einstein was given the Nobel Prize for his discoveries. Although he also did many other things later, the years 1905 has been called Einstein's "Year of Wonders". It has been 100 years since then. Because of this, the UN has named 05 the World Year of Physics. Today, over fifty years after Einstein's death, a question is asked,  " Will there ever be another Einstein?" It may take a long time. After all, Einstein was born more than 200 years after Sir Isaac Newton, another great scientist. Besides, physics is a different field now, and education is different, too. Even if you can't be the next great scientist, it is still helpful to remember some of the things that made Einstein great. He thought independently  and read widely. He left with us a formula  for life: If A is a success in life, then A="X+Y+Z." X is work, Y is play, and Z is keeping your mouth shut. Question: What does Einstein's formula for life mean? Answer:

OPTIONS:
- Success means years of hard work.
- Success means all study and no play.
- Success means working hard, relaxing and not talking too much.
- Success is a secret that nobody knows.

A: Success means working hard, relaxing and not talking too much.


Q: Read the following article and answer the question. Article: When early colonial settlers went to America, they took many forms of dance to _ . Square dancing, one of the oldest forms of American folk dancing, developed from several different Old World group dances, mainly English country dances, and the French quadrille . In the American version of square dancing, four couples form a square and dance to music. An American addition to square dancing is the caller. What do you think a caller does? The callers---someone who calls out the dance steps in time to the music--- was a completely American invention. At first dancers memorized all the steps for a particular dance, but eventually the dances became so complicated that it was necessary to have someone call out cues   so that dancers didn't have to remember so many steps. The caller didn't just call out "do-se-do your partner"; a good caller also came up with colorful sayings or witty lines that he said in between the cues such as "Don't be shy and don't be afraid. Swing on the corner in a waltz promenade  ." A caller might also come up with new dance steps and routines. Although popular for years, square dancing seemed to be going out of style and fading away until the early 1930s, when Henry Ford helped revive interest in it. Ford, the automobile manufacturer, used to vacation at the Wayside Inn in Massachusetts, where he enjoyed the dance programme run by a man named Benjamin Lovett. Ford asked Lovett to come to Detroit and teach dances, but Lovett said he couldn't because he had a contract with the inn. Ford solved that problem by buying the inn and Lovett's contract. He took Lovett back to Detroit, where together they established a programme for teaching squares and rounds. Square dancing was updated and groups began forming all over the country. Question: What is the best title for the passage? Answer:

OPTIONS:
- The Different Steps of Square Dancing
- The Origin and Development of Square Dancing
- Who Was the Inventor of Square Dancing?
- Why Did Square Dancing Go Out of Style?

A:
Answer: The Origin and Development of Square Dancing