问题 单项选择题

传统认为,哺乳动物冬眠的奥秘在于心脏。无论冬眠动物,还是非冬眠动物,甚至人类,其心脏工作原理是相同的。当钙离子流进心脏的细胞时,就引起心脏收缩;当钙离子随即排出细胞时,心脏又开始舒张。但是随着温度的降低,非冬眠动物的心脏细胞排出钙离子的能力明显降低,从而使心脏的舒张越来越困难,最后导致死亡;而此时冬眠动物的心脏细胞则完全与此相反。因此心脏细胞调节钙离子浓度的机制,是冬眠时心脏正常活动的关键所在。对冬眠动物心脏丁作原理的解说,符合文意的是( )。

A.当心脏收缩时,钙离子就流进心脏细胞;当心脏舒张时,钙离子就从心脏细胞中排出
B.随着温度的降低,心脏细胞排出钙离子的能力也相应提高
C.即使在低温条件下,心脏仍能保持与非低温条件下收缩和舒张的原状不变
D.心脏细胞排出钙离子的能力明显增强,从而使心脏的收缩也随之增强

答案

参考答案:B

解析: A项因果关系倒置,应为“钙离子流进心脏细胞时,引起心脏收缩”,“钙离子从心脏细胞排除时,心脏开始舒张”。C项应为“在低温条件下,冬眠动物的心脏细胞排除钙离子的能力比非低温条件下明显增强,心脏的舒张能力也增强”。D项排除,因为钙离子能力增强时,心脏舒张能力增强,而不是收缩能力增强。故选B。

完形填空

阅读表达(共5小题,每小题2分,满分10)

阅读下面短文并回答问题,然后将答案写到答题卡相应的位置上(请注意问题后的字数要求

(1) What is the single largest cause of sick leave in the UK? The answer is not the common cold or flu, but back pain. Back pain affects one in three British adults, costs the country over £5 billion every year and is extremely difficult to treat.

(2)But now Britain's National Health Service (NHS) will be offering a new solution: acupuncture (针灸).The ancient Chinese needle treatment has been around in the UK for many  years, but this is the first time it has been officially supported.

(3)Traditionally, doctors in the UK have advised back pain sufferers to stay active, do stretching exercises and take painkillers when necessary. In more serious cases some people are given X-ray treatment or injections.

(4)The National Institute for Clinical Excellence (NICE), however, say there is evidence that acupuncture may_____ than expensive X-rays or injections, so patients who have been suffering for over six weeks should be given a choice. As an alternative to acupuncture, patients will be able to opt for either a course of spinal manipulation (脊椎推拿), or a series of special exercise sessions.

(5)In the UK, acupuncture is classed as a complementary treatment, which is the term given to a medical procedure which hasn't gone through the strict trials by which scientists prove some treatments work.

(6)While many experts have welcomed the move to make acupuncture available on the NHS, some are still sceptical about its effectiveness. Research from the US earlier this month found that simulated acupuncture using toothpicks which do not make a hole in the skin could be as good as using real needles. So while some are yet to be convinced, back pain sufferers will be hoping that acupuncture helps get them feeling healthy and mobile again. Employers, on the other hand, will be hoping it gets them back to work.

小题1:What's the best title of the text?(No more than 10 words)

小题2:Complete the following statement with proper words.(no more than 3 words)

Not all experts are convinced of the benefit of acupuncture although many of them have ______for the application of the treatment

小题3:Fill in the blank in Paragraph 3 with proper words。(no more than 5 words)

小题4:What’s the difference between simulated acupuncture using tooth picks and real acupuncture?

(No more than 20 words)

小题5:What does the word “it”(Line 2,Paragraph 2)probably refer to? (no more than 5 words)

单项选择题