Until mow, only injectable vaccines against influenza have been available.Parents are reluctant to subject children to the pain of injections, but adults, who are at risk of serious complications from influenza, are commonly vaccinated.A new influenza vaccine, administered painlessly in a nasal spray, is effective for children.However, since children seldom develop serious complications from influenza, no significant public health benefit would result from widespread vaccination of children using the nasal spray.
Which of the following is an assumption on which the argument depends?
A.Any person who has received the injectable vaccine can safely receive the nasal-spray vaccine as well.
B.The new vaccine uses the same mechanism to ward off influenza as jnjectable vaccines do.
C.The injectable vaccine is affordable for all adults.
D.Adults do not contract influenza primarily from children who have influenza.
E.The nasal spray vaccine is mot effective when administered to adults.
这个是比较简单的，只有D选项有not，正确答案也就是D
GWD-9-Q40:
Agricultural societies cannot exist without staple crops. Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods. All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams. Therefore, discovering when rice and yams were introduced into western Africa would establish the earliest date at which agricultural societies could have arisen there.
Which of the following is an assumption on which the argument depends?
A.People in western Africa did not develop staple crops that they stopped cultivating once rice and yams were introduced.
B.There are no plants native to western Africa that, if domesticated, could serve as staple food crops.
C.Rice and yams were grown as staple crops by the earliest agricultural societies outside of western Africa.
D.Kola and okra are better suited to growing conditions in western Africa than domesticated rice and yams are.
E.Kola and okra were domesticated in western Africa before rice and yams were introduced there.
A,B都有否定的词，这个时候看看argument，讲的是rice and yams与agricultural societies 的关系，B说的是native plant，与题目不紧密，PASS，剩下A，A也是正确答案
Agricultural societies cannot exist without staple crops. Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods. All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams. Therefore, discovering when rice and yams were introduced into western Africa would establish the earliest date at which agricultural societies could have arisen there. Which of the following is an assumption on which the argument depends?
A.People in western Africa did not develop staple crops that they stopped cultivating once rice and yams were introduced.
B.There are no plants native to western Africa that, if domesticated, could serve as staple food crops.
C.Rice and yams were grown as staple crops by the earliest agricultural societies outside of western Africa.
D.Kola and okra are better suited to growing conditions in western Africa than domesticated rice and yams are.
E.Kola and okra were domesticated in western Africa before rice and yams were introduced there.
A,B都有否定的词，这个时候看看argument，讲的是rice and yams与agricultural societies 的关系，B说的是native plant，与题目不紧密，PASS，剩下A，A也是正确答案
