3. C[解析]这句话的意思是陡峭的楼梯对老年人来说是很危险的。句中hazard意为危险,危害,如,The car had its hazard warning lights on.这辆汽车亮起了危险信号灯。四个选项中A项意为证据,如,There wasnt enough evidence to prove his guilt.没有充分的证据能证明他有罪。B项意为事件,案件,如,In your case,we are prepared to be lenient.根据你的情况,我们拟予以从宽处理。C项意为危险,如,Violent criminals like that are a danger to society.那种暴力罪犯对社会是一种危害。D项意为图片。因此只有C项符合题意。
4. D [解析]这句话的意思是这个项目需要十年的勤奋调查。句中diligent意为 勤劳的,勤奋的,如,John is more diligent than anyone else in his class.约翰比班上其他的同学用功。四个选项中A项意为科学的,如,Scientific knowledge was perverted to help cause destruction and war.科学知识被滥用于破坏和战争。B项意为基础的,如,Food,clothing and shelter are all basic necessities of life.衣、食、住所是生活的基本必需品。C项意为社会的,如,Her research is centered on the social effects of unemployment.她的研究课题是失业对社会的影响。D项意为勤劳的,刻苦的,如,He is,so to speak,a hardworking student.他可以说是个用功的学生。因此只有D项符合题意。
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