题目内容
【题目】下列说法不正确的是
A．钢是铁合金，钢的含碳量低于生铁，性能优于生铁
B．金属具有的物理通性是具有良好的延展性、导热性、导电性，并有银白色光泽
C．符号Al既能表示铝元素，又能表示一个铝原子，还能表示铝单质
D．焊锡是锡铅合金，把铅加入锡中制成合金的主要目的是降低熔点
【答案】B
【解析】A．钢的含碳量是：0.03%~2%，生铁的含碳量是：2%~4.3%。钢的性能优于生铁，正确；B．金属具有的物理通性是具有导电性、延展性、导热性、大多数是银白色光泽的物质，Cu是红色，Au是黄色金属，错误；C．符号Al是铝元素的元素符号，既能表示铝元素，又能表示一个铝原子，还能表示铝单质，正确；D．合金的特性之一是合金的熔点一般要比其组分低，焊锡的熔点要低于锡和铅，所以在焊接金属时，为节约时间，节约能源、节约成本采用锡铅合金，所以焊锡是锡铅合金，把铅加入锡中制成合金的主要目的是降低熔点，正确。
【题目】用方框中所给短语的适当形式填空。
approve of compare with dream of give thought to on average be sensitive to be full of have a tendency to |
【1】 He others’ comments.
【2】 I hope you our counter offer.
【3】 You romanticize your life.
【4】 Her parents her marriage.
【5】 a quite ordinary star, like the sun, the earth is small indeed.
【6】 She shame at her bad behavior at the news.
【7】 I shouldn’t doing such a thing.
【8】 ，15 worth of goods is stolen every day.
【题目】请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个词。注意：每个空格只填1个单词。
Aspirin
Aspirin (acetylsalicylic acid) has been used for many years as a painkiller. It also has an anti-inflammatory (消炎) action and can be used to reduce fever. Aspirin is already recommended for people to prevent stroke and heart attack because it improves one's blood circulation. So many people already take daily aspirin as a heart drug. Although aspirin can cause deadly internal bleeding, which is relatively rare, its benefits for people are great, not only to help increase the length of people's lives, but to prevent and treat cancer, or to stop cancer spread according to the latest research.
Taking a low dose (剂量) of aspirin every day can prevent and Rothwell, from Oxford University, and his colleagues, who carried out the latest work, had already linked aspirin with a lower risk of certain cancers, particularly bowel（肠） cancer. But their previous work suggested people needed to take the drug for about 10 years to get any protection. Now the protective effect occurs much sooner—within three to five years—based on a new analysis of data from 51 trials involving more than 77,000 patients. And aspirin appears not only to reduce the risk of developing many different cancers in the first place, but may also stop cancers spreading around the body.
Taking a low (75 — 300mg) daily dose of aspirin appeared to cut the total number of cancer cases by 25 % after only three years—there were nine cancer cases per 1,000 each year in the aspirin-taking group, compared with 12 per 1,000 for those taking dummy pills. It also reduced the risk of a cancer death by 15% within five years (and sooner if the dose was higher than 300mg). And if patients stayed on aspirin for longer, their cancer death risk went down even further—by 37% after five years.
Low-dose aspirin also appeared to reduce the probability that cancers, particularly bowel, would spread to other parts of the body, and by as much as half in some instances. However, Prof. Rothwell says for most fit and healthy people, the most important things they can do to reduce their lifetime cancer risk is to give up smoking, take exercise and have a healthy diet.
But experts warn that there is still not enough proof to recommend it to prevent cancer cases and deaths and warn that the drug can cause dangerous side effects like stomach bleeding. Prof. Peter Johnson of Cancer Research UK, along with other experts, said it was still a good idea that people thinking of taking aspirin should first consult their doctors because of the possible side effect. And people should get some decisive advice from the government as to whether aspirin should be recommended more widely and the government should also advise the public about the benefits and risks of aspirin.
Aspirin | |
Functions | To reduce fever To 【1】 Pains To prevent stroke and 【2】 attack |
【3】 effect | To cause cause deadly internal 【4】 |
Fresh evidences | To cut the total number of cancer cases by 【5】 To 【6】 the risk of certain cancers within five years and of a cancer death by 15% within five years and by 37% after five years. To make it 【7】 to prevent the spread of cancer |
【8】 opinion | People should discuss with their doctors 【9】 taking aspirin. The public should be 【10】 about the benefits and risks of aspirin. |
【题目】
用方框中所给单词或短语的适当形式填空。
in one’s defence contrary to in the minority considering take over be highly sensitive to do somebody a favour as much as |
【1】 his age, John did quite well in his performance.
【2】 I don’t like to ask people for help as a rule but I wonder if you could .
【3】 The more I think about him, the more reasons I find for loving him _ I did.
【4】 When she fell ill her daughter the business for her.
【5】 Some people’s teeth cold.
【6】 this, Ham finds out that his father was a wizard.
【7】 While the army takes both men and women, women are
【8】 I must say _ that she works very hard.