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[主观题]
Scientists first ____ the idea of the atomic bomb in the 1930s
.
A) competed B) conceived C) consumed D) concealed
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A) competed B) conceived C) consumed D) concealed
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更多“Scientists first ____ the idea…”相关的问题
It was in 1930s that scientists first ______ the idea of the atom bomb.
A．imagined
B．contemplated
C．reckoned
D．conceived
Modern science came into being ______.
A．when the method of controlled experiment was first introduced
B．when Galileo succeeded in explaining how things happen
C．when Aristotelian scientists tried to explain why things happen
D．when scientists were able to acquire an understanding of reality by reasoning
The last sentence of the first paragraph can best be understood as______.
A．most scientists are obliged to teach
B．a scientist may cultivate wide interests if he teaches as well
C．in order to keep up with developments in a wider field, teaching and research are both important
D．if a scientist does not teach, he is less likely to absorb diverse knowledge
Scientists first ________ the idea of the atom bomb in the 1930s.
A) imagined
B) conceived
C) considered
D) acknowledged
The men who first made use of meteoritic metal were ______.
A．small isolated tribes
B．those who did not revere meteorites
C．nineteenth century scientists
D．warriors
A．achieve
B．accomplish
C．fulfill
D．complete
A、create
B、created
C、have created
D、has created
A．When the method of controlled experiment was first introduced.
B．When Galileo succeeded in explaining: how things happen.
C．When Aristotelian scientists tried to explain why things happen.
D．When scientist were able to acquire an understanding of reality by reasoning.
The first study was done at Duke University in Durham, North Carolina. Researchers pumped extra carbon dioxide into a test area where pine trees were growing. The trees grew thirty -four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients, such as nitrogen.
In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was released into the atmosphere as carbon dioxide.
The findings of the two studies were published last month in Nature magazine. They suggest there is limited value in planting trees to reduce the carbon dioxide pollution in the atmosphere.
Forest planting has been a part of negotiations on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other industrial countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates on the ability of forests to absorb carbon dioxide were overly hopeful. Some scientists not involved in the studies say the research provides some of the first evidence on how trees react to carbon dioxide. Other scientists say the research disputes a belief among some coal and power companies. The companies say that rising levels of carbon dioxide in the atmosphere will not create harmful global warming. Instead, they say it will increase forests and other plants.
What is the purpose of this passage？
A．Introduce some new ideas about the relationship between trees and carbon dioxide.
B．Introduce recent condition of global industrial pollution.
C．Call on people to plant more trees to reduce greenhouse gases.
D．Point out that power companies should be responsible for the rising levels of carbon dioxide.
听力原文： One way that scientists learn about man is by animals, such as mice, rats and monkeys. The scientists in this laboratory are experimenting on mice. They are studying the relationship between diet and health. At this time over one hundred experiments are going on in this laboratory.
In this experiment, the scientists are studying the relationship between the amount of food the mice eat and their health. The mice are in three groups. All three groups are receiving the same healthy diet. But the amount of food that each group is receiving is different. The first group is eating one cup of food each day, the second is eating two cups, and the third group of mice is eating three cups.
After three years, the healthiest group is the one that is only eating one cup of food each day. The mice in this group are thinner than normal mice. But they are more active. Also they are living longer. Mice usually live tot two years. Most of the mice in this group are still alive after three years. The second group of mice is normal weight. They are healthy, too. They are active, but not as active as the thinner mice. But they are only living about two years. The last group of mice spends most of the day eating or sleeping. They are not very active. These mice are living longer than the scientists thought: about a year and a half. But they are not healthy. The experiment is still going on. The scientists hope to finish their studies in two years.
(33)
A．Mice
B．Rats
C．Monkeys
D．A，B and C
