In his youth, Knute Axelbrod wanted to learn many languages, to know everything about human history , to【C1】______wise by reading great books. When he first came from Europe【C2】______the state of North Dakota, he worked in a mill all day【C3】______studied all evening. Then he met Lena Wesselius and【C4】______her at the age of eighteen. After that there was a farm to pay for, and there were children to【C5】______. For many years Axelbrod had no time to study. : !.
Finally he had a farm【C6】______was free from debt, with good soil and plenty of animals. But【C7】______then he was sixty-three years old and ready(it seemed)to die. His wife was【C8】______. His sons had grown【C9】______and gone away. His work was done. He was【C10】______and alone.
Axelbrod's daughter and【C11】______begged him to live with them, but he【C12】______. "No," he said, "You must learn to be【C13】______. You will come and live here【C14】______my farm, and【C15】______will pay me four hundred dollars a year【C16】______the use of it,【C17】______I will not live here with you. I will watch you from my hill. "
He built himself a small house on the hill, 【C18】______he cooked his【C19】______, made his bed, and read many books from the public library. He began to feel that he was【C20】______free than ever before in his life.
【C1】
A. be
B. grow
C. become
D. turn
Hormones are tested in the research because they can affect ______.
A. one's bodyweight
B. one's blood pressure
C. one's way of living
D. one's metabolic rate
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Looking for a new weight loss plan? Try living on top of a mountain. Mountain air contains less oxygen than air at lower altitudes, so breathing it causes the heart to beat faster and the body to burn more energy. A handful of studies have found that athletes training at high altitudes tend to lose weight. Doctor Florian Lippl of the University Hospital of Ludwig-Maximilians-University Munich wondered how the mountain air would affect overweight individuals if they weren't doing any more physical activity than usual.
Lippl and his colleagues invited 20 overweight men to an environmental research station about 300 meters below the summit of Zugspitze, a mountain around 2,970 meters near the Austrian border. They were allowed to eat as much as they liked. The men also gave blood so that researchers could test for hormones(荷尔蒙) linked to appetite and fatness. At the end of the week, the men, whose mean weight starting out was 105 kg, had lost on average about 1.5 kg. The men's blood pressure also dropped, which the researchers attributed to weight lost.
Exactly what caused the weight loss is uncertain. Loss of appetite is common at higher altitudes, and indeed the men ate significantly less than usual--about 700 calories fewer per day. Lippl also notes that because their consumption was being recorded, they may have been more self-conscious about what they ate. Regardless, eating less accounts for just 1 kg of the 1.5 kg lost, says Lippl. He thinks the increased metabolic(新陈代谢的) rate, which was measured, also contributed to weight loss but cannot separate the different effects with the given data.
Appetite loss at high altitudes could certainly be key, notes Damian Bailey, a physiologist at the University of Glamorgan, UK, who recently lost 11 kg during a 3-month expedition to the Andes in Chile.
Unfortunately, for the average person there's no treatment that can resemble living at high altitude, says Lippl. The only alternative is a hypobaric chamber, which exposes subjects to low oxygen and isn't practical as a therapy. He says, half-jokingly, "if fat people plan their holidays, they might not go to the sea, but maybe to the mountains."
What contributes the most to one's heart rates, according to the first paragraph?
A. Our bodyweight.
B. The consumption of energy.
C. The rates of our breathing.
D. The amount of oxygen provided.