题目内容
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A．them as microcosm of living organisms
B．the microcosm of living organisms
C．the microcosm of living organisms to be
D．as which, the microcosm of living organisms
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更多“Cells,first identified by the …”相关的问题
A、A skin
B、B mucosa
C、C innate immune cells
D、D adaptive immune cells
A、aerobic
B、anaerobic and autotrophic
C、anaerobic and heterotrophic
D、auxotrophic
E、autotrophic
A、Primordial germ cell
B、Primary oocyte
C、Secondary oocyte
D、First polar body
A．The flow of electrical impulses through nerve cells at the site of the injury is broken.
B．The production of substance P traveling through nerve cells to the brain increases.
C．Endorphins begin to speed up the response of nerve cells at the site of the injury.
D．A flood of prostaglandins sensitizes nerve endings at the site of the injury.
E．Nerve cells connected to the spinal cord become electrically quiescent.
A．malignant cells in him were unable to develop into deadly ones
B．he was a generous man with immense energy and curiosity
C．the Lithic Lab at the Ohio State Museum employed him
D．he was determined that he was able to deter the disease
A.a single type of multipotent stem cell found in the bone marrow
B.differentiated cells that first developed in the fetal liver, but now reside in the bone marrow
C.division of differentiated cell types while circulating in the blood
D.stem cells that became committed to each specific blood celll type during embryonic development
Which of the following is NOT true in the case of pathological fatigue？
A．You are involved in so many activities that you have to be in two places at once.
B．Your body has a disease.
C．The cells fail to deal with fighting the disease and keeping you alive at the same time.
D．The first thing to do is to cure the disease.
According to the WHO, the organisms carried by mosquitoes __________.
A) are the food for larvae
B) have led to the death of millions of people in the world
C) invade red blood cells first and then destroy major organs
D) can enter a person’s brain through the mosquito’s bite
Which of the following is NOT true in the case of pathological fatigue？
A．You arc involved in so many activities that you have to be in two places at once.
B．Your body has a disease.
C．The cells fail to deal with fighting the disease and keeping you alive at the same time.
D．The first thing to do is to cure the disease.
听力原文：W: ok, last night you were supposed to read an article about human bones. Are there any comments about it？
M: well, to begin with, I was surprised to find out there were so much going on in bones. I always assumed they were pretty lifeless.
W: Well, that's an assumption many people make. But the fact is bones are made of dynamic living tissue that requires continuous maintenance and repair.
M: Right. That's one of the things I found so fascinating about the article the way the bones repair themselves.
W: Ok. So can you tell us how the bones repair themselves.
M: Sure. See, there are two groups of different types of specialized cells in the bone that work together to do it. The first group goes to an area of the bone that needs repair. This group of cells produce the chemical that actually breaks down the bone tissue, and leaves a hole in it. After that the second group of specialized cells comes and produce the new tissue that fills in the hole that was made by the first group.
W: Very good. This is a very complex process. In fact, the scientists who study human bones don't completely understand it yet. They are still trying to find out how it all actually works. Specifically, because sometimes after the first group of cells leaves a hole in the bone tissue, for some reason, the second group doesn't completely fill in the hole. And this can cause real problems. It can actually lead to a disease in which the bone becomes weak and is easily broken.
M: ok, I get it. So if the scientists can figure out what makes the specialized cells work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue every time. That'll prevent the disease from every occurring.
(31)
A．Two different types of bones in the human body.
B．How bones help the body move.
C．How bones continuously repair themselves.
D．The chemical composition of human bones.
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