B. they are cheap (未提及的信息 )
42. The word detected in paragraph 3 could be best replaced by ___.
C. discovered
单词所在语境: signs of change in the tissues of the brain and head can be detected with scanning
43. The salesman retired young because ___
C: He couldnt remember simple tasks
文章相关句: A traveling salesman had to retire at a young age because of serious memory loss. He couldnt remember even simple tasks.
44. On the safety issue of mobile phones, the manufacturing companies ___.
D. hold that the amount of radiation is too small to worry about
文章中的相关句: Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about
45. The writers purpose of writing this article is to advise people ___.
C. to use mobile phones less often
文章中相关句: so far now, its wise not to use your mobile phone too often.
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