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关于贮精囊（ seminal vesicle ）和纳精囊（ seminal receptacle ）的叙述，错误的是：
- A.贮精囊是自体精子贮精和发育的器官，纳精囊主要接受异体精子
- B.纳精囊是自体精子贮精和发育的器官，贮精囊主要接受异体精子
- C.贮精囊和纳精囊是贮存精子的不同器官的名称
- D.每条环毛蚓都同时具有这二种器官
Alzheimer's disease is a major national health problem. Nearly 2 million Americans over the age of65 have Alzheimer's disease. It is a leading cause of death among the elderly. But Alzheimer's disease is not confined (限于) to the aged. There may be a million or more people under the age of 65 suffering from the disease.
At one time, people suffering from the disease were said to be "getting old". The disease was thought to be a natural part of growing old, but it is now known that Alzheimer's disease strikes young and old alike. It is an organic (器官的) disease, that destroys brain cells.
Alzheimer's disease affects the patient's memory, speech, and movement. In the beginning stages of the disease, the patient may seem slightly confused. He may have trouble speaking．then the patient's memory begins to fail. He may forget dates, numbers, names and plans.
As the disease progresses, the patient may not recognize family and friends. These symptoms(症状) often cause terrible anxiety in the patient. He may feel lost and frightened. Sometimes the patient reacts with wild and bad behavior.
In the last stages of the disease, the patient may not be able to take care of himself. He may have lost the ability to speak and walk.
Scientists don't know exactly what causes Alzheimer's disease. It may be caused by a virus (病毒). It may be caused by a poisonous substance(物质) in the environment. At present, there is no cure for the disease. But there are ways to slow its progress. Exercise and physical treatment can help the patients of this disease.
The main idea of the passage is that Alzheimer's disease _________ .
A．is a terrible part of the aging process
B．is an organic disease that affects young and old
C．can be cured by physical treatment
D．causes forgetfulness
All of the following are symptoms of Alzheimer's disease EXCEPT__________．
A．forgetfulness
B．difficulty in speaking
C．loss of sight.
D．loss of the ability to walk
According to the passage, which of the following may be a cause of Alzheimer's disease?
A．Poisons produced by the brain．
B．Getting old.
C．A virus.
D．Lack of exercise.
The press of Alzheimer's disease can be slowed by
A．operation
B．a change in environment
C．medicines
D．physical treatment and exercise
查看习题详情和答案>>One day a few years ago, a very funny thing happened to a neighbor of mine. He is a teacher at one of London's big medical schools. He had finished his teaching for the summer term and was at the airport on his way to Russia to give a lecture.
He had put a few clothes and his lecture notes in his shoulder bag , and he had put Rupert , the skeleton (人体骨架）to be used in his lecture , in a large brown suitcase. At the airport desk, he suddenly thought that he had forgotten to buy a newspaper. He left his suitcase near the desk and went over to the shop.
When he got back, he discovered that someone had taken his suitcase by mistake. He often wonders what they said when they got home and found Rupert.
Who wrote the story?
A. Rupert's teacher. B. The neighbor's teacher.
C. A medical school teacher. D. The teacher's neighbor.
Why did the teacher put a skeleton in his suitcase?
A. He needed it for the summer term in London.
B. He needed it for the lecture he was going to give.
C. He wanted to take it to Russia for medical research.
D. He wanted to take it home as he had finished his teaching.
What happened at the airport?
A. The skeleton went missing. B. The skeleton was stolen.
C. The teacher forgot his suitcase. D. The teacher took the wrong suitcase.
Which of the following best tells the teacher's feeling about the incident?
A. He was angry. B. He thinks it very funny.
C. He feels helpless without Rupert. D. He feels good without Rupert.
Which of the following might have happened afterwards?
A. The teacher got back the suitcase but not Rupert.
B. The teacher got back neither the suitcase nor Rupert.
C. The teacher got back Rupert but not the suitcase.
D. The teacher got back both the suitcase and Rupert.
查看习题详情和答案>>Sometime today—perhaps several times—Dick Winter will think about the 19-year-old who saved his life.
Because of this young man, Winter enjoys things like friendships, colours and laughter every day.
The young man saved Winter's life by signing an organ donor card(器官捐献卡).
“I can't say thank you enough,” Winter said yesterday at a news conference marking the tenth anniversary of the Multi Organ Transplant program at Toronto General Hospital.
What Winter knows of the 19?year?old who saved his life is only that he died in a car accident and that his family was willing to honour his wishes and donate
his organs for transplantation.
His liver(肝脏) went to Winter, who was dying from liver trouble. “Not a day goes by that I don't think of what a painful thing it must have been for them，”Winter said yesterday.
“They are very, very special people.”
Winter, 63, is fitter now than he was 10 years ago, when he got the transplant. He has five medals from the 1995 World Transplant Games in swimming and hopes to
collect some more next year in Japan.
“At one time, we were probably strange people in the eyes of other people. Now it's expected you should be able to go back and do everything you did before, only better.”
The biggest change for Winter, however, isn't that he has become a competitive athlete. The biggest change is how deeply he appreciates every little thing about
his life now.
“I have no time for arguments,” said Winter.
“You change everything. Material things don't mean as much. Friendships mean a lot.”
Also at yesterday's news conference was Dr Gray Levy, Winter's doctor.
Levy said he has bitter?sweet feelings when he looks at Winter and hears of his athletic exploits.
Levy knows that for every recipient(接受者) like Winter, there are several others who die even though they could be saved because there aren't enough donated organs.
“For every Mr Winter,we have five to 10 people that will never be given the chance that Mr Winter was given，” Levy said.
Levy said greater public awareness and more resources are needed. He noted that in Spain and the United States, hospitals receive 10,000 per donor to cover the costs of the operating room, doctors, nurses and teams to work with the donors' families.
1.Which of the following is true about the 19-year-old?
A.He died of liver trouble.
B.He got wounded in a battle.
C.He was willing to donate his organs.
D.He became a recipient of a prize.
2.What do we learn about Dick Winter?
A.He is becoming less competitive now.
B.He is always thinking about his early life.
C.He knows all about the young man and his family.
D.He values friendships more than material things.
3.Dr Levy would agree that ________.
A.Spanish hospitals have more favorable conditions for organ transplant
B.the Canadian public have realised the importance of organ donation
C.Spanish hospitals received more money from the donors
D.Canadian hospitals now have enough donated organs
4.What's the author's purpose in writing this article?
A.The public should give more support to organ transplant.
B.Transplant patients are thankful for the help they receive.
C.Transplant can change a patient's life greatly.
D.It is not easy to get organs for transplant.
查看习题详情和答案>>How can you find out what is going on inside a person' s body without opening the patient up? Regular X-rays can show a lot. CAT scans can show even more. They can give three-dimensional(三维) view of body organs(器官).
What is a CAT scan? CAT stands for Computerized Axial Tomography(层面X线照相术). It is a special X-ray machine that gets a 360 - degree picture of a small area of a patient's body.
Doctors use X-rays to study and examine diseases and injuries within the body. X-rays can find foreign objects inside the body or to take pictures of some organs inside if special things as dyes or special liquids are added to the organs to be X-rayed.
A CAT scanner, however, uses a beam(光束) of X-rays to give a cross-sectional view of a particular part of the body. A fine beam of X-rays is scanned across the body and circled around the patient from many different angles(角度). A computer analyzes(分析) the information from each angle and produces a clear cross-sectional picture on the screen. This picture is then photographed for later use. Several cross-sections, taken one after another, can give a clear "photo" of the entire body or of any body organs. The newest CAT scanners can even give a clear picture of active, moving organs just as a fast-action camera can "stop the action" giving clear pictures of what appear only mistily(模糊) to the eye. And because of the 360 - degree pictures, CAT scans show 3-dimensional views of organs in a manner that was once only seen during surgery or autopsy (examining a dead body).
According to the first two paragraphs, doctors can see the inside of a patient's body by ______.
A. giving the patient an operation
B. checking body organs
C. getting a 360-degree picture of a small area of a patient's body
D. examining the CAT
From the last paragraph, we can infer that ______.
A. the newest pictures become more misty
B. many pictures can be taken at the same time
C. the information about the scanned patient is not highly valued
D. some pictures of the scanned parts of the body are developed for further examinations in the future
The best title of this passage might be ______.
A. Modern X-ray B. Three-dimensional View
C. Fast - moving Camera D. CAT Scan
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