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6. Compared with previous studies, the recent one found that ______.

A. a lower-salt diet may mean less sugar-sweetened soft drink consumption

B. a low-salt diet keeps children out of high blood pressure

C. children face the risk of having strokes and heart attacks

D. low-salt food products do not do harm to people’s health

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5. According to the passage, obesity is directly linked to ______.

A. high-salt foods   

B. sugar-sweetened soft drinks

C. high blood pressure  

D. strokes and heart attacks

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4. Which of the following is the right order of the events?

a. became a doctor

b. became a full time writer

c. started to publish comic short stories

d. wrote regularly for a local daily newspaper.

e. entered the Moscow University Medical School

A. e→c→a→d→b

B. d→a→b→c→e

C. e→c→b→a→d

D. a→e→c→b→d

(二)

“Children who eat less salt and drink fewer sugar-sweetened soft drinks may significantly lower their risks of obesity,” researchers recently reported in the journal Hypertension.

“Sugar-sweetened soft drinks are a significant source of calorie intake in children,” said Feng J. He, a researcher at St George’s University of London, England. “It has been shown that sugar-sweetened soft drink consumption is related to obesity in young people.” They wanted to know whether there is a link between salt intake and sugar-sweetened soft drink consumption.

Dr He and colleagues analyzed data from a 1997 national survey of more than 2,000 people between 4 and 18 in Britain. “We found that children eating a lower-salt diet drank less fluid,” said He. “From our research, we estimated that 1 gram of salt cut from their daily diet would reduce fluid intake by 100 grams per day.”

The researchers also found that children eating a lower-salt diet drank fewer sugar-sweetened soft drinks. From their research, they predicted that reducing salt intake by 1 gram each day would reduce sugar-sweetened soft drink consumption by 27 grams per day, after. “If children aged 4 to 18 cut their salt intake by half, there would be a decrease of about two sugar-sweetened soft drinks per week per child, so each child would decrease calorie intake by almost 250 kilocalories per week,” Dr He said.

In previous studies, researchers found that a low-salt diet lowers blood pressure in children, and prevents the development of high blood pressure later in life. “Both high blood pressure and obesity increase the risk of having strokes and heart attacks,” Dr He said.

Dr He recommends that parents check labels and choose low-salt food products. “Small reductions in the salt content of 10 to 20 percent cannot be detected by the human salt taste receptors (感受器) and do not cause any technological or safety problems,” Dr He said.

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3. Which of the following adjectives can’t be used to describe Chekhov?

A. Sensitive.

B. Cool.

C. Quick-minded.

D. Warm-hearted.

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2. In 1880, Chekhov ________.

A. became a full-time writer

B. studied medicine in Moscow University

C. practiced medicine in his hometown

D. published his most memorable stories

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1. Anton Pavlovich Chekhov ________.

A. had a lawful lover

B. was an illegal writer

C. used to be a lawyer

D. was a competent doctor

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21.(本小题满分14分)

双曲线的中心是原点O,它的虚轴长为,右焦点为F(c,0)(c>0),直线轴交于点A,且| OF |= 3 | OA |.过点F的直线与双曲线交于P、Q两点.

(1)求双曲线的方程;

(2)若=0,求直线PQ的方程.

2010年普通高等学校招生全国统一考试第六次适应性训练

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20.(本小题满分13分)

已知函数. 

(1) 当时,求函数的单调区间和极值;

(2) 若上是单调增函数,求实数的取值范围.

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19. (本小题满分12分)

已知数列是等差数列, ;数列的前n项和是,且

(1) 求数列的通项公式; 

(2) 求证:数列是等比数列;

(3) 记,求的前n项和.

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18.(本小题满分12分)

如图,在四棱锥中,,底面是菱形,且的中点.

(1)求四棱锥的体积

(2)证明:平面

(3)侧棱上是否存在点,使得平面?并证明你的结论.

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