*Question*
Read the following article and select the best answer. Article: Everybody may have seen the film "Death on the Nile (n. )", but nobody can imagine that the writer of the story, Agatha Christie, saved a baby in a most unusual way. In June 1977, a baby girl became seriously ill in Deleville. Doctors there were unable to find out the cause of her illness, so she was sent to a famous hospital in London, where there were many excellent doctors. The baby was so seriously ill that a team of doctors hurried to examine the baby without delay. The doctors, too, were puzzled by the baby's illness and they also became discouraged. Just then a nurse asked to speak to them. "I think the baby is suffering from thallium (n. ) poisoning. " said the nurse. "A few days ago, I read a story 'A Pale Horse' written by Agatha Christie. Someone uses thallium poison, and all the symptoms are written in the book. They are exactly the same as the baby's." "You're very good at observing things," said a doctor, "and you may be right. We'll carry out some tests and find out whether the cause is thallium poisoning or not." The tests proved that the baby had indeed been poisoned by thallium. Once they knew the cause, the doctors were able to give her correct treatment. The baby soon got well and was sent back to Deleville A week later, it was reported that the poison might have come from an insecticide (n. ) used in Deleville. Question: As far as we can tell from the story, Agatha Christie _ . - had never met this baby - had spent a long time studying the baby's illness - visited the baby both in Deleville and London - gave the nurse some advice on the telephone
**Answer**
had never met this baby

*Question*
Read the following article and select the best answer. Article: On December 26, a ten-year-old British schoolgirl, Tilly Smith, felt that something was wrong while she was on the beach with her family. Her mind kept going back to the geography lesson Mr. Kearney gave just two weeks before she flew to Thailand with her family. "The water was swelling and kept coming in," said Tilly's mother. "There was froth on it like you get on the top of a beer." The Smiths were celebrating Christmas at Maikhao Beach in southern Thailand. Deadly tsunami waves were already on their way. There had been an earthquake not far away earlier that morning. The beach was getting smaller and smaller. Tilly's parents felt strange but they didn't know what was happening. Then Tilly said she'd just studied this at school. She told her parents that a tsunami was coming. In the end she screamed at everyone to get off the beach. Tilly's parents even didn't know what a tsunami was. Seeing their daughter so frightened, they thought that something serious must have been happening. Her parents soon took her and her seven-year-old sister back to the hotel. Many other tourists also left the beach with them. The family stayed on the third floor of their hotel. Fortunately, the hotel wasn't destroyed during the tsunami. Tilly's mother said that if they had stayed on the beach, they wouldn't have survived. After the disaster, the Smiths met people from nearby resorts who had lost their whole families. More than 100 people were saved because of Tilly's warning. Question: How did Tilly know that the tsunami was coming? - Her mother told her that there was something wrong. - Mr. Kearney told her in the geography lesson two weeks ago. - She got the news from other people on the beach. - She had just studied the knowledge about this at school.
**Answer**
She had just studied the knowledge about this at school.

*Question*
Read the following article and select the best answer. 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: Why did the female bird sing according to Paragraph 4? - It wanted to show its singing talent to the partner. - It aimed at keeping the partnership with the male. - It wanted to frighten the other females. - It wanted to make her mate more attractive.
**Answer**
It aimed at keeping the partnership with the male.