| a survey was recently conducted among ferry passenger on the Nor th Sea.Among the results was this:more of those who had taken anti-seasickness medication before their trip reported symptom of seasickness than those who had not taken such medication.It is clear ,then,that depite claims by drug companyies that clinical test show the contrary.people would be better off not taking anti-seasickness medications
which can weak the conclusion
A .Given rough enough wether,most ferry passengers will have same symptom of seasickness
B. The clinical tests reported by the drug companies were conducted by the drug companies
C.People who don't take anti-seasickness medications are just as likely to respont to a survey on seasickness as people who do
D.the seasickness symptoms of the people who took anti-seasickness medication would have been more severe had they not taken the medications
C,D哪个正确啊,我觉得题的意思是:吃晕船药的人比没吃药的晕船多,结论没看懂,better off not taking 是最好吃还是不吃啊 | 
