单项选择题
激发情感导入一般( )课使用的多。
A.
语文
B.
数学
C.
英语
D.
物理
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(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioaetive carbon (present) in the object (is examined).A.The age ofB.be estimatedC.presentD.is examined
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It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. If the things to be found are actually new, they are by definition unknown in advancE.You cannot make choices in this matter. You either have science or you don't, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly useful bits.The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about naturE.Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its Way, an illuminating piece of news. It would have amazed the brightest minds of the 18th century Enlightenment to be told by any of us how little we know and how bewildering seems the way aheaD.It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answereD.Because of this, we are depresseD.It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusteD.But we are making a beginning, and there ought to be some satisfaction. There are probably no questions we can think up that can't beanswered, sooner or later, including even the matter of consciousness. To be sure, there may well be questions we can't think up, ever and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, and pay attention.According to the author, really good science ______.A.would surprise the brightest minds of the 18th century EnlightenmentB.will produce results which cannot be foreseenC.will help people to make the right choice in advanceD.will bring about disturbing results
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听力原文：W: Exercise, exercise, exercisE.We hear so much about it these days, yet even the experts can't agree on which exercises are best. Now some doctors are strongly encouraging arm exercises.M: Arm exercises? Is that because our arms are too fat or flabby?W: Actually, that's not the main reason. They say that arm exercises are an ideal way to become physically fit.M: But don't arm exercises raise your blood pressure?W: That they do. But the article I read mentioned ways to compensate for that.M: How?W: By adding leg exercises, so the arms don't do all the work. Ann exercises alone aren't enough to increase metabolism before fatigue sets in. The more of the body that's involved in the exercise, the better.M: And in turn, I'm sure that there's a greater chance of losing weight.W: Sounds right to mE.M: So what exercises do the experts recommend?W: They mentioned quite a few but some of the more popular ones are cycling with special bicycles that make you use both your arms and legs, and walking vigorously while you wear arm weights.M: I must try that, I like to walk a lot.(23)A.They don't get rid of flabby arms.B.They can damage arm muscles.C.They aren't acceptable to most peoplE.D.They can raise one's blood pressurE.
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