A．You need to pay $50 to sign up a child for the club.

　　B．Club members enjoy free travel insurance for any flight.

　　C．The advertisement is intended for students of all ages.

　　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12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。

　　B

　　(2015·山西省太原市二模)

　　Washington: NASA has announced evidence that Jupiter's largest moon, Ganymede, has a saltwater ocean under its icy surface. The ocean seems to have more water than all the water on Earth's surface, according to new Hubble observation.

　　New Hubble observations of Ganymede's magnetic field strongly suggest that the moon, which is the largest in our whole solar system, is home to a subsurface ocean.

　　Scientists estimate the ocean is 95 kilometres thick, which is about 10 times deeper than Earth's oceans. But unlike our salty waters, Ganymede's ocean is buried under 150 kilometres of ice.

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