Unlike most normal jobs where men and women are on par with each other, being a soldier or
A、(1)
B、(2)
C、(3)
D、(4)
A、(1)
B、(2)
C、(3)
D、(4)
A.1.?Cancer cells have a reduced dependence on signals from other cells for their survival, growth, and division. 2.?Cancer cells can survive levels of stress and internal derangement that would cause normal cells to kill themselves by apoptosis.
B.3.?Unlike most normal human cells, cancer cells can often proliferate indefinitely.?4. Most cancer cells are genetically unstable,with a greatly increased mutation rate and an abnormal number of chromosomes.
C.5. Cancer cells are abnormally invasive,at least partly because they often lack certain cell adhesion molecules, such as cadherins, that help hold normal cells in their proper plac
E.?6. Cancer cells are abnormally avid for nutrients, which they use to generate much of their ATP by glycolysis in the cell cytosol.
D.7. Cancer cells can survive and proliferate in abnormal locations, whereas most normal cells die when misplace
D.?8. As cancer cells evolve,they secrete signals that influence the behavior of cells in the surrounding connective tissue,thereby modifying the tumor’s microenvironment.
DDT, the most powerful pesticide the world had ever known,exposed nature’s vulnerability. Unlike most pesticides, which effect- __1__
A、all chromosomes found in a normal human cell
B、those chromosomes found in egg or sperm cells
C、all chromosomes other than the sex chromosomes
D、chromosome pairs with unlike members
听力原文: Most people feel lonely sometimes. But it usually only lasts between a few minutes and a few hours. This kind of loneliness is not serious. In fact, it is quite normal for some people though, loneliness can last for yeas. Now researchers say there are three different types of loneliness.
The first kind of loneliness is temporary. This is the most common type. It usually disappears quickly and does not require any special attention. The second kind, situational loneliness, is a natural result of a particular situation—for example, a family problem, the death of a loved one, or moving to a new place. Although this kind of loneliness can cause physical problems, such as headaches and sleeplessness, it usually does not last for more than a year. The third kind of loneliness is the most severe. Unlike the second type, chronic loneliness usually lasts more than two years and has no specific cause. People who experience habitual loneliness have problems socializing and becoming close to other. Unfortunately, many chronically lonely people think them is little or nothing they can do to improve their conditions.
Psychologists agree that one important factor in loneliness is a person's social contacts, e.g., friends, family member, co-workers, etc. We depend on various people for different reasons. For in stance, our families give us emotional support, our parents and teachers give us guidance, and our friends shore similar interests and activities. However, psychologists have found that, though lonely people may have many social contacts, they sometimes feel they should have more. They question their own popularity.
(30)
A.Types of Loneliness.
B.Causes of Loneliness.
C.Solutions to Loneliness.
D.Loneliness.
听力原文: Most people feel lonely sometimes. But it usually only lasts between a few minutes and a few hours. This kind of loneliness is not serious. In fact, it is quite normal, For some people though, loneliness can last for years. Now researchers say there are throe different types of loneliness.
The first kind of loneliness is temporary. This is the most common type. It usually disappears quickly and does not require any special attention. The second kind, situational loneliness, is a natural result of a particular situation for example, a family problem, the death of a loved one, or moving to a new place. Although this kind of loneliness can cause physical problems, such as headaches and sleeplessness, it usually does not last for more than a year. The third kind of loneliness is the most severe. Unlike the second type, chronic loneliness usually lasts more than two years and has no specific cause. People who experience habitual loneliness have problems socializing and becoming close to others.
Unfortunately, many chronically lonely people think there is little or nothing they can do to improve their conditions.
Psychologists agree that one important factor in loneliness is a person's social contacts, e. g. , friends, family members, co-workers, etc. We de pend on various people for different reasons. For instance, our families give us emotional support, our parents and teachers give us guidance, and our friends share similar interests and activities. However, psychologists have found that, though lonely people may have many social contacts, they some times feel they should have more. They question their own popularity.
Which of the following is the best title of the passage?
A.Types of Loneliness.
B.Causes of Loneliness.
C.Solutions to Loneliness.
D.Loneliness.
A、Achondroplasia is incompletely dominant to the normal condition.
B、Achondroplasia is codominant to the normal condition.
C、The allele that causes achondroplasia is a dominant lethal allele.
D、The allele that causes achondroplasia is a recessive lethal allele.
E、The allele that causes achondroplasia is a late-onset lethal allele.
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文: Imagine this: you wake up each morning to find your sister lying beside you. To get dressed and tie your shoes, you use one hand and she uses another. You do everything out together, even sitting on the same chair at lunch and riding on the same bicycle. That's what life is like for six-year-old Betty and Abby. Like most twins, the two girls look very much alike. But unlike most twins, Betty and Abby share parts of the same body. Twins like Betty and Abby are rare. Only about 40 sets are born in the United States each year. Few survive as long as Betty and Abby. That's because twins often share vital organs, like a heart or brain. The shared organs are often badly shaped and may not be strong enough to support both twins. But Betty and Abby each has her own head, heart and stomach which function normally. They have three or four lungs which provide plenty of oxygen for both twins. Most of their completely shared organs fie below the waist. Betty and Abby five relatively normal fives. They attend a regular school, and each does her own school work. They prefer to do some projects together, though, for example, to cut out paper dolls, one twin holds the paper, while the other uses the scissors. But sometimes the girls don't want to do the same thing, for example, sometimes they want to play with different toys. What do they do then? "We toss a coin," says Abby.
(27)
A.They think exactly the same way.
B.They are not physically separated.
C.They share most of their vital organs.
D.They make decisions by tossing coins.
A. used to eating
B. are used to eating
C. are used to eat
D. used to eat
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