D
Is a recently discovered hormone the reason why folks who lose weight can’t keep it off?
Like millions of other fat people, at 530 inches high, more than 300 pounds, Carnie Wilson was not just fat. After trying all sort of diets that didn’t work,
she has to go to the stomach – bypass surgery (胃部迂回手术), ie, have most of her stomach sewed up, only leaving tiny room to hold several tablespoonfuls at most. Result: she simply couldn’t eat the way she used to. In three years, Wilson is one third of her former weight.
Wilson’s experience is not all that unusual, and while doctors still aren’t exactly sure what is going on, a report in last week’s Journal of Medicine offers an explanation. The loss of appetite in bypass patients may be linked to a recently discovered hormone called ghrelin. Not only that, ghrelin may turn out to be one reason we feel hungry and it’s hare for didters to keep weight off.
Nowadays, researchers are careful to stress only what they know for sure. For the three conclusions, the leading Dr. David of the University of Washington says, “I feel very solid about two of them.” The first is that ghrelin levels in the bloodstream rise significantly before meals and drop afterward. The second conclusion is that ghrelin levels are higher on average in people who have lost weight from dieting.
Dr. David is less sure of the third conclusion, that bypass patients have only a quarter as much ghrelin as most people of normal weight. After all, ghrelin is produced by cells in the stomach. Years ago, leptin, a hormone was found as an appetite suppressant (食物抑制剂). But after years of trying, it had to be given up.
What doctor
s suspect is that both leptin and ghrelin are part of a complex system of brain and body chemicals that govern weight and appetite. That does not mena pharmaceutical (药物的) weight control is forever out of the question. “In the next ten years, we will be able to develop new drugs to help people lose weight healthily and effectively.”
47．What can we learn about ghrelin according to the passage?
A．After meals ghrelin levels are higher in the bloodstream.
B．People who have lost weight have less ghreilin in their body.
C．Without ghrelin, people are really difficult to lose weight.
D．Ghrelin is something produced by cells in the stomach.
48．What is Dr. David not sure?
A．pharmaceutical weight control is impossible.
B．There is less ghrelin in the bypass patients.
C．new drugs will be developed in 10 years.
D．ghrelin levels are higher in people on diet.
49．In fact, people’s weight and appetite are controlled by
A．ghrelin and leptin B．hormone and medicine
C．brain and body chemicals D．stomach and food
50．What can we infer from the passage?
A．People with a lower ghrelin level go hungry easily.
B．Doctors managed to use leption to control the appetite.
C．Doctors are optimistic about how to lose weight healthily.
D．The loss of appetite in bypass aptient is linked to leptin
第三部分：语法填空（共两节，满分20分，每小题1分）
根据文段内容或提示，填写正确的单词，每空只能填写一个单词。
A
No one knows exactly __31___ the earth began, as it happened so long ago. However, according to a __32___ (wide) accepted theory, the universe began ___33___ a “Big Bang” that threw matter in all directions…..What it was to become was __34___(certain) until between 4.5 and 3.8 billion years ago __35___ the dust settled into a solid globe. The earth became so violent __36___ it was not clear whether the shape would last or not…….People are__37__ (put) too much carbon dioxide into the atmosphere, which prevents heat from __38____(escape) from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So __39____life will continue on the earth for millions of years to come will depend on whether this problem can be __40___(solve).
第二节语法填空(共10小题；每小题1.5分，满分15分)
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为31～40的相应位置上。
Just like other _31__ , English changes and develops when cultures meet and communicate with each other. At first, the English spoken in England between about AD 450 and 1150 was very different __32__ today’s English. It was 33___ (base) more on German than the English we speak at present. Then __34__(gradual) between about AD 800 and 1150, English became less like German because those__35_ ruled England spoke first Danish and later French. These new settlers enriched____36__ ( rich ) the English language and especially its vocabulary. So by the 1600’s Shakespeare was able to make use of _37__ wider vocabulary than ever before. In 1620 some British settlers moved to America .Later in the 18th century some British people ___38__(take) to Australia too. English _39___(begin)to be spoken in both countries. Finally by the 19th century the language was settled and now English is also spoken as a foreign or second language in South Asia and __40___parts of the world.
C
I began as a (91) ___________machine in 1642. It took nearly two hundred years (92) ___________I was built as an analytical machine. I became a “universal machine” in 1936 to (93) ___________any mathematical problem. I was very big at one time. However, as time (94),___________,I was made smaller and smaller. I was given a family (95) ___________by a network in the early 1960s. I was able to (96) ___________my knowledge with others (97) ___________the World Wide Web.
I have been widely used in many fields, such as in communication, (98) ___________,trade and medical (99) ___________.I have also been put into robots and space rockets to (100) ___________the Moon and Mars. I’m glad I am a devoted friend and helper of the human race.
B
A(n) (81) ___________writer about 2,000 years ago called Pausanias came on a(n) (82) ___________journey to find out about the present-day Olympic Games. He interviewed a(n) (83) ___________named Li Yan. He learned that there were two main (84) ___________of Games—the Winter and Summer Olympics, and that both were held four years on a regular (85) ___________.Anyone who has reached an agreed standard for their event can be admitted as (86) ___________.To Pausanias’s surprise, women are playing a very important role in many games. Every country wants to (87) ___________the Olympic Games, and it is a great (88) ___________but also a great honour to be chosen. Li Yan told him that the Chinese were very (89) ___________because the 2008 Olympic Games would be held in Beijing. Pausanias was happy to know the (90) ___________of the Olympics—“Swifter, Higher and Stronger” and he felt very interested in it.
第四部分：写作（共四节，满分45分）
第一节：根据课文内容将下面短文补充完整，单词的首字母已经为你写出(注意:在答卷上要写出所填单词的首字母及其它字母的正确形式，否则不给分)。
A
The Amber Room, which was considered one of the (71) ___________of the world, had an (72) ___________history. The room was designed in the (73) ___________style and (74) ___________with gold and jewels.
In 1716, Frederick William I, to whom the Amber Room (75) __________, gave it to Peter the Great. So it became part of the Czar’s winter palace in St Petersburg and served as a small (76) ___________hall for important visitors.
Later, Catherine II had it (77) ___________to a palace outside St Petersburg and told her artists to add more details to it. But in 1914, when Russia and Germany were at (78), ___________the Nazi army entered the summer palace, (79) ___________some treasures secretly. After that, what happened to the Amber Room remains a (80) ___________.
Recently, a new Amber Room has been built at the summer palace by the Russians and Germans.