单选题If you're in charge of Christmas dinner, with all its interconnected tasks and challenges of timing—when to preheat the oven whether to put the potatoes in before the eggs—why not write down every 26 that needs doing, in order, then do them, checking them off as you go? That can be very helpful. The Checklist Manifesto, written by the journalist and doctor Atul Gawande, shows the importance of checklist when hospital doctors are 27 to tick off items on checklists as they carry out routine but critical procedures. In one trial, the rate of infections from intravenous (静脉内的) drips fell from 11% of all patients to zero 28 because staff were compelled to work through a checklist of no-brainer items, such as 29 their hands. A more recent study, which included UK hospitals, suggested that wider use of checklists might 30 40% of deaths during treatment. Unlike in medicine, the 31 uses of checklists in everyday life—a list for holiday packing, for instance, aren't usually matters of life and death. The idea of making a checklist is so stupidly obvious that it seems impossible it could have so 32 an effect. But the truth is that all life, not just medicine, is 33 complex; if highly trained intensive-care specialists can forget a 34 step, it's sure that anyone might. Besides, the step-by-step structure of checklists can narrow your 35 to the next action. All you have to remember is to 'do the next right thing'. Then the next, and the next. A. potential B. required C. crucial D. subject E. vast F. action G. washing H. prevent I. simply J. increasingly K. focus L. normally M. gradual N. request O. shaking

单选题The school arranged road trip appears to ______ the spring break.

单选题In old China women used ______.

单选题 Spiders are known for many things. Sociability is not one of them. Most spiders are more likely to try to eat their neighbours than befriend them. Given that there are at least 43,678 species of spiders, though, it is not too surprising that a few have overcome their natural bad-temper and teamed up to form societies. So far, about two dozen such social spiders have been identified. And among them, something really strange has just been found. For one type of spider society turns out to involve two different but closely related species. It is as though anthropologists (人类学家) had discovered villages populated both by human beings and chimpanzees. This was discovered by a team led by Lena Grinsted of Aarhus University in Denmark. They were studying a social species of spider called Chikunia nigra, living near Beratan Lake in Bali. Later, as they looked in more detail at their samples, they realised its genes showed that it was actually two species. It is not clear why the spiders being social. They do not hunt together. One explanation may be that the colony is acting like a huge kindergarten. Ms. Grinsted discovered this possibility by experiment. First, she identified 19 females who were looking after those who were recently born, and another 20 who had eggs. In each case she introduced a new comer, in the form of a spider from the same colony. Both mothers and mothers-to-be were surprisingly tolerant of what would, in most spider species, be a serious threat. Only 40% of the time did they attempt to chase the intruder away, or bite it. Ms. Grinsted then took another 40 spiders and replaced some of their little spiders. The result, she found, was that a female was as likely to look after and protect another's young spider as she was her own. Which is interesting, but not all that extraordinary in social groups which are composed of closely related individuals. Except that Ms. Grinsted now knows that this cannot always be the case for her spiders, since two different species are involved. The species in question are pretty similar, which would seem to exclude another common cause of co-action: different spiders doing different work in the group. Because Ms. Grinsted did not know at the time of her experiment that two species were involved, she cannot be sure how many of the newly-born spiders she interfered were cross-specific. The two species seem more or less equal in number, so chances are it was about half of them. If colony members are acting as foster mothers in the wild, something most odd is going on. Altruism(利他) is not a concept often associated with spiders. Xenophilic(种族间的) altruism is truly strange.

单选题 Memory can be both enhanced and impaired by use of drugs.

单选题Speaker A: I'm afraid I failed the math exam.Speaker B: ______,it's not really that bad, is it? A. Oh, yeah B. No wonder C. There now D. No good

单选题The instruction ask that we ______ a red pen.

单选题The government ______ the foreign-owned corporations one after another.

单选题They had fierce______as to whether their company should restore the trade relationship which was broken years ago.

单选题According to the passage, A-type individuals are usually ______.

单选题The coal miners went on strike because they thought their wages were too ______.

单选题There is a ______ difference in meaning between the words "surroundings" and "environment".

单选题______we have finished the text, we shall start doing more revision exercises.

单选题The employer tried to bully his employees from staging strikes by threatening to close down the entire plant.

单选题I couldn't the lecture at all. It was too difficult for me.

单选题Which of the following example's tells us that the animals also have a kind of culture difference

单选题Conversation becomes weaker in society that spends so much time listening and being talked to _______ it has all but lost the will and the skill to speak for itself. 

单选题This ticket ______ you to a free meal in our new restaurant. A. gives B. grants C. entitles D. credits

单选题Only recently ______ possible to separate the components of fragrant substances and to determine their chemical composition.