[解析]
(1)段落大意题。根据第二段People are invited randomly and paid to take part in trials of an experimental drug,or new surgical procedure,in a number of countries at the one time.(人们被随机邀请并支付报酬,同时在多个国家参加实验性药物或新外科手术的试验。)可知第二段主要讲述医学试验的程序。故选B。
(2)细节理解题。根据第四段Doctors say that the risk is not so great during the trial itself,where patients are closely monitored,but comes when the drug is released on the market place.For example,in 2004 a US company recalled an arthritis drug,when it was found that after 18 months of use,the risk of heart attack and stroke increased.(医生们说,在试验期间,患者受到密切监测,风险并不大,但当药物投放市场时,风险就会出现。例如,2004年,一家美国公司召回了一种关节炎药物,因为它被发现在使用18个月后,心脏病发作和中风的风险增加了。)可知作者在第四段提到这个例子实在解释一些药物在出售时出现的风险。故选D。
(3)词义猜测题。根据划线词上文People who support testing claim the risks to the individual are small compared with the benefits.(支持测试的人声称,与好处相比,测试对个人的风险很小。)可推测下文意思是"即使患者有不良后果,病情恶化,这对制药公司来说也是有价值的信息。"由此可猜测单词adverse意为"负面的",A.negative负面的;B.effective有效的;C.subjective主观的;D.impressive印象深刻的。故选A。
(4)推理判断题。根据最后一段While the drug companies usually pay for the hospital trials,government has set up medical committees to handle the issue.(虽然通常由制药公司支付医院试验费用,但政府已经成立了医疗委员会来处理这一问题。)可推断下文最有可能讨论医疗委员会如何解决这个问题。故选D。