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Since the matter was extremely ________, we dealt with it immediately.
A) tough
B) tense
C) urgent
D) instant
答案
更多“Since the matter was extremely ________, we dealt with it immediately.A) toughB) te”相关的问题
第1题
第2题
A．Y
B．N
C．NG
第3题
A.enables
B.renders
C.injures
D.flushes
第4题
Since chimpanzees are genetically very. similar to humans, ______.
A．chimpanzees are likely to suffer AIDS just like humans if they are infected
B．it does not matter if human beings are infected with SIV rather than HIV - 1
C．we can use human vaccines to prevent chimpanzees from getting AIDS virus
D．AIDS vaccines based on chimp's immune mechanism are possible to be made
第5题
A) More studies should be conducted before conclusions are drawn.
B) It should come to an end since the matter has now been settled.
C) The past studies in this field have proved to be misleading.
D) He more than agrees with the views held by the alarmists.
第6题
W: Your biological rhythms probably haven't adjusted to the time schedule here.
Q: What is the man's trouble？
(15)
A．He is suffering from the difference of time zones.
B．He has been studying hard at night.
C．He finds biology difficult to learn.
D．He has not adjusted to a new culture.
第7题
W: Your biological rhythms probably haven't adjusted to the time schedule here.
Q: What is the man's trouble？
(15)
A．He is suffering from the difference of time zones．
B．He has been studying hard at night．
C．He finds biology difficult to learn．
D．He has not adjusted to a new culture．
第8题
Dear Sir,
I first applied for the installation of a telephone on July 15th, 2007, and since then I have renewed my (144) several times. Rather to my disappointment, each time I received the same reply that there were no telephone wires in my residential area. I have just learned from the morning TV show that the (145) work of lines to my district had been completed three weeks earlier. I should like to remind you of my application and hope that you will (146) my request as soon as possible.
I trust this letter will call your immediate attention to the matter, thus ending the long wait.
Yours Sincerely,
Tom Green
(44)
A．request
B．reply
C．rescue
D．reserve
第9题
第10题
Black Holes
What is a black hole？ Well, it's difficult to answer this question, since the terms we normally use to describe a scientific phenomenon are inadequate here, Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape—not even light. So we can't see a black hole. A black hole exerts (施加) a strong gravitational (重力的) pull and yet it has no matter. It is only space—or so we think. How can this happen？
The theory is that some stars explode when their density increases to a particular point; they "collapse" and sometimes a supernova (超新星) occurs. The collapse of a star may produce a "White Dwarf (白矮星) "or a "neutron star"—a star whose matter is so dense that it continually shrinks by the force of its own gravity. But if the star is very large this process of shrinking may be so intense that a black hole results. Imagine the earth reduced to the size of a marble, but still having the same mass and a stronger gravitational pull, and you have some idea of the force of a black hole. Any matter near the black hole Is sucked in. It is impossible to say what happens Inside a black hole.
Our space and time laws don't seem to apply to objects in the area of a black hole. Einstein's relativity theory is the only one that can explain such phenomena. Einstein claimed that matter and energy are interchangeable, so that there is no "absolute" time and space, There are no constants at all, and measurements of time and space depend on the position of the observer— they are relative. Einstein's theory provided a basis for the idea of black holes before astronomers started to find some evidence for their existence. It is only recently that astronomers have begun specific research into black holes.
The most convincing evidence of black holes comes from research into binary (由两部分组成的) star systems. In some binary star systems, astronomers have shown that there is an invisible companion star, a "partner" to the one which we can see in the sky. There is one star, called by its catalogue number HDE 226868, which must have a Partner. This partner star, it seems, has a mass ten or twenty times greater than the sun—yet we can't see it. Matter from HDE 226868 is being dragged towards this companion star. Could this invisible star, which exerts such a great force, be a black hole？ Astronomers have evidence of a few other stars too, which might have black holes as companions.
Which of the following does NOT fit the definition of the black hole？
A．The black hole is a region of space.
B．The black hole sucks in any object that passes by it.
C．The black hole is visible through an infrared telescope.
D．The black hole has no matter.
