四级选词填空

2013年6月大学英语四级考试真题及答案详解

Walking, if you do it vigorously enough, is the overall best exercise for regular physical activity. It requires no equipment, everyone knows how to do it and it carries the 47 risk of injury. The human body is designed to walk. You can walk in parks or along a river or in your neighborhood. To get 48 benefit from walking, aim for 45 minutes a day, an average of five days a week.

Strength training is another important 49 of physical activity. Its purpose is to build and 50 bone and muscle mass, both of which shrink with age. In general, you will want to do strength training two or three days a week, 51 recovery days between sessions.

Finally, flexibility and balance training are 52 important as the body ages. Aches and pains are high on the list of complaints in old age. The result of constant muscle tension and stiffness of joints, many of them are 53 , and simple flexibility training can 54 these by making muscles stronger and keeping joints lubricated (润滑). Some of this you do whenever you stretch. If you watch dogs and cats, you’ll get an idea of how natural it is. The general 55 is simple: whenever the body has been in one position for a while, it is good to 56 stretch it in an opposite position.

A) allowing F) helping K) prevent

B) avoidable G) increasingly L) principle

C) briefly H) lowest M) provoke

D) component I) maintain N) seriously

E) determined J) maximum O) topic

2012年12月大学英语四级考试真题及答案详解

Questions 47 to 56 is based on the following passage.

So many people use the cell phone so frequantly every day,But ___47__little is certain adout he health effects of its use.Macufacturers___48___that cell phones meet government standards for safe radio- frequency radiation omission,but enough studies are beginning to document a possible ___49___in rare brain tumour(肿瘤)：bendaches and behavioral disorders in children to cause coneem.So far,the avidence isn't___50___on whether the use of cell phones __51__to any uncased risk of cancer.In a new

trial,researchers asked 47 yolunteers to ___52__in a project to measure glucose(葡萄糖)consurnption in the brain by scanning the brain to see how cells use energy.For both 50- minute scans,the volunteers had a cell phone __53__to each ear.During be first scan,the devices were turned off,but for the second scan,the phone on the right ear as___54____on and received a recorded- message call,although the yolume was muted(消毒)so the dise wouldn't bias the results.The results of the second scan abowed that the__55__of the brain rarest to the device had higher rales of glucose consumption than the rest of the brain.The study ows that cell phones can change brain activity,and __56__a whole new avenue for scientific quiry,tuough it doesn't say anything about whether cell-phone radiation can cause cancer.

注意：此部分试题请在答题卡2上作答。

A)conclusive I)mission