题目内容
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It is not feasible to wait four days until the body______(use)to the new time zone.
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更多“It is not feasible to wait fou…”相关的问题
The writer has listed why cloning is not feasible to be ___on humans.
A.amended
B.adopted
C.adjusted
D.adapted
A.visible
B.invisible
C.out of sight
D.Feasible
Many students are marrying as an escape, not only from an unsatisfying home life, but also from their own personal problems of isolation and loneliness. And it can almost be put down as a dictum that any marriage entered into as an escape cannot prove entirely successful. The sad fact is that marriage seldom solves one's problems; more often, it merely accentuates them. Furthermore, it is doubtful whether the home as an institution is capable of carrying all that the young are seeking to put into it; one might say in theological terms, that they are forsaking one idol only to worship another. Young people correctly understand that their parents are wrong in believing that" success" is the ultimate good, but they erroneously believe that they themselves have found the true center of life's meaning. Their expectations of marriage are essentially utopian and therefore incapable of fulfillment. They want too much, and tragic disillusionment is often bound to follow.
Shall we, then join, the chorus of" Miseries" over early marriages？ One cannot generalize: all early marriages are not bad any more that all later ones are good. Satisfactory marriages are determined not by chronology, but by the emotional maturity of the partners. Therefore, each case must be judged on its own merits. If the early marriage is not an escape, if it is entered into with relatively few illusions or false expectations, and if it is economically feasible, why not？ Good marriages can be made from sixteen to sixty, and so can bad ones.
According to this passage, the trend toward early marriages ______.
A．can be clearly seen
B．is the result of the Great Depression of the 30's
C．can't be easily determined
D．is an outgrowth of the moral looseness brought about by World War Ⅱ
While it's true that just about every cell in the body has the instructions to make a complete human, most of those instructions are inactivated, and with good reason: the last thing you want for your brain cells is to start churning out stomach acid or your nose to turn into a kidney. The only time cells truly have the potential to turn into any and all body parts is very early in a pregnancy, when so-called stem cells haven't begun to specialize.
Yet this untapped potential could be a terrific boon to medicine. Most diseases involve the death of healthy cells-brain cells in Alzheimer's, cardiac cells in heart disease, pancreatic cells in diabetes, to name a few. If doctors could isolate stem cells, then direct their growth, they might be able to furnish patients with healthy replacement tissue.
It was incredibly difficult, but last fall scientists at the University of Wisconsin managed to isolate stem ceils and get them to grow into neural, gut, muscle and bone cells. The process still can't be controlled, and may have unforeseen limitations; but if efforts to understand and master stem-cell development prove successful, doctors will have a therapeutic tool of incredible power.
The same applies to cloning, which is really just the other side of the coin; true cloning, as first shown with the sheep Dolly two years ago, involves taking a developed cell and reactivating the genome within, resetting its developmental instructions to a pristine state. Once that happens, the rejuvenated cell can develop into a full-fledged animal, genetically identical to its parent.
For agriculture, in which purely physical characteristics like milk production in a cow or low fat in a hog have real market value, biological carbon copies could become routine within a few years. This past year scientists have done for mice and cows what Ian Wilmut did for Dolly, and other creatures are bound to join the cloned menagerie in the coming year.
Human cloning, on the other hand, may be technically feasible but legally and emotionally more difficult. Still, one day it will happen. The ability to reset body cells to a pristine, undeveloped state could give doctors exactly the same advantages they would get from stem cells., the potential to make healthy body tissues of all sorts, and thus to cure disease. That could prove to be a true "miracle cure."
The writer holds that the potential to make healthy body tissues will ______.
A．aggravate moral issues of human cloning
B．bring great benefits to human beings
C．help scientists decode body instructions
D．involve employing surgical instruments
Part III Reading Comprehension (40 minutes)2016年6月大学英语四级卷1真题及答案
Section A
Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.
Questions 26 to 35 are based on the passage you have just heard.
Physical activity does the body good, and there's growing evidence that it helps the brain too. Researchers in the Netherlands report that children who get more exercise, whether at school or on their own,26to have higher GPAs and better scores on standardized tests. In a27of 14 studies that looked at physical activity and academic28, investigators found that the more children moved, the better their grades were in school,29in the basic subjects of math, English and reading.
The data will certainly fuel the ongoing debate over whether physical education classes should be cut as schools struggle to30on smaller budgets. The arguments against physical education have included concerns that gym time may be taking away from study time. With standardized test scores in the U.S.31in recent years, some administrators believe students need to spend more time in the classroom instead of on the playground. But as these findings show, exercise and academics may not be32exclusive. Physical activity can improve blood33to the brain, fueling memory, attention and creativity, which are34to learning. And exercise releases hormones that can improve35and relieve stress, which can also help learning. So while it may seem as if kids are just exercising their bodies when they're running around, they may actually be exercising their brains as well.
A)attendance
B)consequently
C)current
D)depressing
E)dropping
F)essential
G)feasible
H)flow
I)mood
J)mutually
K)particularly
L)performance
M)review
N)survive
O)tend
已知f1(t)=tε(t)，f2(t)=ε(t)-ε(t-2)，求y(t)=f1(t)*f2(t-1)*δ'(t-2)。
