题目

为了搞清食道癌与长期食用亚硝胺污染的食物的关系，可选用的方法是( ) A．利用实验动物进行长期模拟观察 B．随机抽样调查吸烟和食用过热食物人群的发病率 C．对患病高发区与低发区食物中亚硝胺含量进行对比 D．在患者家系中调查统计发病率   答案：AC探究食道癌的发病率与长期食用亚硝胺污染食物的关系，可采用实验法和调查法。其自变量是食物中亚硝胺的含量，因变量是食道癌的发病率，至于是否抽烟、食物过热等因素为无关变量，要控制好。因该病的自变量与遗传因素无关，不能局限于患者家系中调查统计发病率。  阅读理解。     In 1995, Walt Disney (迪斯尼) himself opened the first Disney Park in Los Angeles , the USA . Later Disney world was opened in Florida in 1971 . It cost between $500 and $600 million to build . Tokyo Disney Park opened in Japan in 1983, and Europe (欧洲) Disney opened in France in 1992.      Now Hong Kong is going to build a Disney park and it will be open in 2005.      More than 80% of Hong Kong's population would like to visit the Disney park when it is opened. But about half of them thought the adult admission fee (成人参观费), of between HK $ 250 to HK $ 300(US $32 to US $ 38), was too high. The children's admission fee is not known yet. But children may not  mind paying any entrance fee. "If I start saving money now, I'll have enough money to pay the entrance fee in five year's time, " said Chan Posang, a 12 years old girl. "I can't take my son to the Disney park in the USA, " said Mrs Yu, mother of a small boy, "that's why I agree with the government's plan (政府计 划 ) to build one here. There I'll be able to take my son there. The admission fee of several hundred dollars is nothing compared with (与……相比 ) the price (价格) of an air ticket to the USA. "1. The first Disney Park was built in _____.     A. France      B. Tokyo      C. America        D. Hong Kong2. How many Disney parks will there be in Asia ( 亚洲) by the year 2005?    A. 1           B. 2            C. 3              D. 43. What do the Hong Kong people think about the plan?    A. Most of them agree with it        B. Half of them don't agree with it    C. Few of them agree with it         D. Only children like it4. Do all the Hong Kong people care (关心) much about the entrance fee?    A. Yes, they all think that the fee is too high.     B. No, the children may not mind how much the fee will be.     C. Yes, most of them feel that the fee is not high.     D. The writer doesn't tell us. 5. According to the passage, which of the following is TRUE?    A. The adult admission fee is lower than the children admission fee.     B. Disney Parks are getting more and more popular among children and adults.     C. The children's admission fee is about HK $ 250 to HK $ 300.     D. Since the fee is too high, few Hong Kong people want to visit the park.