题目内容
（请给出正确答案）
What do scientists mean by saying that the science of crying is still in its infancy？
A.There is still more to learn about crying．
B.People have known a lot about crying．
C.The science of crying is a subject needed to be learned．
D.The study of crying meets difficulties．
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更多“What do scientists mean by say…”相关的问题
听力原文：M: Hi, Jane! Did you watch that documentary on TV last night？
W: No, I was in a meeting, and didn't get home until 11:50. What was it about'？
M: It was about insects.
W: Insects？
M: Yeah! Do you know they are the most successful creatures on the planet？
W: What, more successful than humans？
M: Well, think about it! They were around long before people were--there are far more insects than humans--I mean, trillions of them! And they are reproducing all the time!
W: Well, I suppose that's true!
M: And they are incredibly adaptable.
W: In what way？
M: Well, take mosquitoes for example. You know, they spread malaria. Malaria is still a big problem in the world. The trouble is that every time we try to wipe out the mosquitoes with some new insecticide, they change their body-chemistry!
W: Haven't the scientists just brought out a new insecticide to fight mosquitoes？
M: Yes, they have. But I bet that within five years the mosquitoes will simply adapt again!
W: I suppose it keeps the scientists employed!
M: Yes! You know, I'd really like to work in that field after I graduate.
W: Why not!
(20)
A．Only mosquitoes can change their body-chemistry.
B．They can transmit a serious disease.
C．We can wipe them out with new insecticide.
D．Within five years scientists will have found a way to kill them all.
听力原文：W: Hi! Did you watch that documentary on TV last night？
M: No, I was in a meeting, and unable to go home early. What was it about？
W: It was about insects.
M: Insects？
W: Yes. Do you know？ They are the most successful creatures on the earth.
M: What, more successful than humans？
W: Yeah. Because they were around long before people were, and there are far more insects than there are humans. What’s more, they are reproducing all the time.
M: Well, I suppose that’s true.
W: And they are incredibly adaptable.
M: In what way？
W: Well, take mosquitoes for example. You know, the things that spread the disease. What troubles us is that every time we try to wipe out the mosquitoes with some new insecticide, they change their body chemistry.
M: Haven’t they just brought out a new medicine to fight the disease？
W: Yes, they have. But I bet that within five years they’ll be looking for a new one! The mosquitoes will simply adapt again!
M: I think it keeps scientists employed!
W: I guess so.
(23)
A．He was watching the documentary on TV.
B．He was attending a party.
C．He was watching a movie.
D．He was attending a meeting.
What can scientists do now？ 查看材料
A.Prescreen a baby"s sex.
B.Screen babies for desirable attributes.
C.Insert genes that parents want.
D.Craft genes in a lab.
According to the passage, what can scientists do now with the genetic testing technology？
A．Prescreen a baby's sex.
B．Screen babies for desirable attributes.
C．Insert genes parents want.
D．Craft genes in a lab.
What do we learn about scientists in earlier times？
A．They claimed to know nothing about nature.
B．They believed in results from scientific observation.
C．They paid much attention to the problems they didn't understand.
D．They invented false theories to explain things they didn't understand.
The passage says that until recently scientists disagreed with the idea ______.
A．that there are mysterious forces in the universe
B．that man cannot discover what forces "really" are
C．that there are serf-evident principles
D．that we can discover why things behave as they do
W: Stem cell research sounds pretty impressive,I'll admit.But just what is it？
M: Well,a stem cell is a special type of cell.It is a general cell that.when it divides.Call become any specific type of cell.
W: You mean,a stem cell can become a heart cell？Or a brain cell or a kidney cell？
M: That's about it.Stem cells are a part of the body's maintenance and repair system.When they divide, they can become any cell type.
W: I guess there would be some tremendous medical advantages in that sort of research.
M: You've said a mouthful.Recently,scientists were able to help a man who lost a jawbone from cancer.They recreated bone material for his jaw from stem cells.What it means is that since the new bone was created out of the person's own cells,there was no problem with rejection because the DNA was the same.
W: I bet the person was delighted.Why would anyone oppose that sort of research？It would seem to have endless potential to benefit the human race.
M: I agree,but there are people who think we should not interfere with nature and mainipulate"what is not natural".
W: It is easier to hold such a narrow view if you're not in a position to need the benefits of the research.If you're missing a jawbone because of cancer,you probably support the research.
What is the man's attitude toward the stem cell research？
A．Supportive.
B．Opposed.
C．Pessimistic.
D．Neutral.
A．It is good for people.
B．It actually does more harm than good.
C．It can help people keep healthy.
D．It can give them more energy.
