D．Any child must be accompanied by at least one paying adult.

　　答案：A　细节理解题。根据文中All bookings made before 12 September will receive free travel insurance...可知，并不是所有的航程都享受免费保险服务，故排除B项；由首段的第一句话可知该俱乐部是针对11岁以下儿童的，故排除C项；根据文中最后的备注Child must be accompanied by two paying adults.可知D项错误。A项中的sign up与首段第一句话中的registration对应，故选A项。

　　(2015·青岛市二模)

　　Scientists investigated why Ebola virus is so deadly when it spreads from animals to humans and then from human­to­human contact. The research team looked at the Zaire Ebola virus in an animal system to understand how it gains strength. This virus is responsible for the current outbreak in West Africa. They found that initially the animal systems were not affected by the virus, but succeeding transmission(传送) into other animals caused the virus to “hot up” and become more severe.

　　The team analyzed the viruses at different stages and were able to identify several changes in its genetic material that were associated with increased disease.

　　Professor Julian Hiscox, who led the study from the University's Institute of Infection and Global Health, explains: “The work tells us that the evolutionary goal of Ebola virus is to become more fatal.”

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