更多"A. is found to be a great deal high"的相关试题:
[填空题]
- A. is found to be a great deal higher than that of seawater
- B. was of little scientific value
- C. may be older than that collected below 39 feet of ice
- D. might have come from Mars
- E. is to collect some briny lake water for analysis
- F. may return to life sooner than microbes frozen in the surface ice
Scientists ignored Lake Vida because they thought that a lake of ice ______.
[单项选择]
| Scientists have learned a great deal
about the kinds of food people need. They say that there are several kinds of
food that people should eat every day. What are these classes of food They are
1) green vegetables of all kinds, such as string beans, peas, lettuces, and
cabbages; 2) fruit, such as apples, peaches and bananas; 3) other vegetables,
examples of these are beets, onions, carrots, tomatoes and so on; 4) meat of all
kinds, fish and eggs; 5) milk and food made from milk, such as butter, cheese
and ice-cream; 6) bread or cereal. Rice is also in this class of food.
People in different countries and different areas of the world eat
different kinds of things. Scientists say that none of these differences are
really important. It doesn’t matter whether food is eaten raw or cooked, canned,
or frozen. It doesn’t matter if a person eats dinner at four o’clock in the
afternoon or at eleven o’clock at night. The important thing, they say, is that
every day a person should eat something from each of these kinds of
food. There are two problems, then, in feeding the
ever-increasing number of people on earth. The first is to find some ways to
feed the world population sd that no one is hungry. The second is to make sure
that people everywhere have the right kinds of food to make them grow to be
strong and healthy. |
What have scientists learned a great deal about
A. The kinds of food that should be eaten every day.
B. Whether to eat food raw or cooked.
C. When to eat food every day.
D. How much food to eat every day.
[单项选择]
Although we already know a great deal about influenza, and although the World Health Organization is constantly collecting detailed information from its chain of influenza reference laboratories throughout the world, it is extremely difficult for epidemiologists (流行病专家), who study infectious disease, to predict when and where the next flu epidemic will occur, and how severe it will be.
There are three kinds of influenza virus, known as A, B and C. Influenza C virus is relatively stable and causes mild infections that do not spread far through the population. The A and B types are unstable, and are responsible for the epidemics that cause frequent concern. Following any virus attack, the human body builds up antibodies which confer immunity to that strain of virus, but a virus with the capacity to change its character is able to by-pass this protection. Variability is less developed in the influenza B virus, which affects only human beings. An influenza B virus may cause a
A. Symptoms of Influenza
B. Man Versus Virus
C. World Health Organization: Forefront against Influenza Virus
D. Variability of Influenza Virus
[单项选择]There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies. To support a conclusion that much of the variation is due to unnecessary surgical procedures, it would be most important to establish which of the following
A. A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary.
B. The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.
C. There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily.
D. For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
E. (E) With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies, and tonsillectomies are representative of surgical procedures in general.
[单项选择]Scientists have learned a great deal about the kinds of food people need. They say that there are several kinds of food that people should eat every day. What are these classes of food They are 1) green vegetables of all kinds, such as string beans, peas, lettuces, and cabbages; 2) fruit, such as apples, peaches and bananas; 3) other vegetables, examples of these are beets, onions, carrots, tomatoes and so on; 4) meat of all kinds, fish and eggs; 5) milk and food made from milk, such as butter, cheese and ice-cream; 6) bread or cereal. Rice is also in this class of food.
People in different countries and different areas of the world eat different kinds of things. Scientists say that none of these differences are really important. It doesn’t matter whether food is eaten raw or cooked, canned, or frozen. It doesn’t matter if a person eats dinner at four o’clock in the afternoon or at eleven o’clock at night. The important thing, they say, is that every day a person should eat someth
A. Eat one’s meals at regular intervals.
B. Eat raw or cooked food, but not canned or frozen food.
C. Eat a variety of necessary foods.
D. Eat vegetables and fruits more than meat and cereal.
