考试吧文都：2012年12月英语四级真题答案及解析

　　Part IV Reading Comprehension (Reading in Depth)

　　Section A

　　Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.

　　Questions 47 to 56 is based on the following passage.

　　So many people use the cell phones so frequently every day. But 47 little is certain about the health effects of its use. Manufacturers 48 that cell phones meet government standards for safe radio-frequency radiation emission, but enough studies are beginning to document a possible 49 in rare brain tumors (脑瘤)，headaches and behavioral disorders in children to cause concern. So far, the evidence isn’t 50 on whether the use of cell phones 51 to any increased risk of cancer . In a new trial, researchers asked 47 volunteers to 52 in a project to censure glucose (葡萄糖) consumption 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 the first scan, the devices were turned off, but for the second scan, the phone on the right ear was 54 on and received a recorded-message call, although the volume was muted(消音)so the noise wouldn’t bias the results. The results of the second scan showed that the 55 of the brain nearest to the device had higher rates of glucose consumption than the rest of the brain. The study shows that cell phones can change brain activity, and 56 a whole new avenue for scientific inquiry, though 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

　　B)contributes 　J)participate

　　C)derive 　K)particular

　　D)expresses 　L)provides

　　E)fixed 　M)regions

　　F)immensely　 N)surprisingly

　　G)increase 　O)switched

　　H)maintain