[单项选择]Although it is the elderly and the young infants who get the siekest from the flu, it is young children who are most susceptible. In community flu outbreaks, it is not unusual for 30 to 40 percent of children to get the infection, perhaps twice the rate of adult infection.
Flu spreads rapidly from child to child for a number of reasons. First, flu is spread by small respiratory droplets that are coughed or sneezed and float in the air. A well child can catch the flu from being in the same classroom or child care center with an ill child without them ever touching each other. (Contrast this with the way colds are usually spread, by large droplets on people’s hands, making good hand washing an effective preventive strategy. )Also, flu appears to be contagious even the clay before symptoms begin, and because children don’t get as sick as adults with the flu, they other stay in school or clay-care long enough to spread the disease to their classmates.
While few otherwise healthy
A. Young children are very susceptible to flu.
B. Well young children are easy to get infected by ill children in community and day-care centers.
C. Adults are at high risk of being infected with flu by contacting their children.
D. All the above.

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[单项选择]Although it is the elderly and the young infants who get the siekest from the flu, it is young children who are most susceptible. In community flu outbreaks, it is not unusual for 30 to 40 percent of children to get the infection, perhaps twice the rate of adult infection.
Flu spreads rapidly from child to child for a number of reasons. First, flu is spread by small respiratory droplets that are coughed or sneezed and float in the air. A well child can catch the flu from being in the same classroom or child care center with an ill child without them ever touching each other. (Contrast this with the way colds are usually spread, by large droplets on people’s hands, making good hand washing an effective preventive strategy. )Also, flu appears to be contagious even the clay before symptoms begin, and because children don’t get as sick as adults with the flu, they other stay in school or clay-care long enough to spread the disease to their classmates.
While few otherwise healthy
A. Taking flu vaccine.
B. Separating ill people from others.
C. Washing hands regularly.
D. Staying at home when flu outbreaks.

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[填空题]Although she is young for the job, she is very (experience) ______.

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[填空题]Although he is young and (experience) ______ , he has done well.

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[填空题]Although he is young and (experience) ______, he has done well.

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[填空题]Although the young couple have a lot in common in .life styles,__________________(但是在政治观点上差异很大).

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[填空题]Although many young people are _____ on going abroad, he prefers to stay and work in his own country.

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[单项选择]
Passage One

Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers.
Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics.
A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands(腺)in the birds’ bodies that may prepare them fo
A. stopped migrating
B. continued migrating
C. stayed in the north
D. migrated south and stayed there

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