A．they may direct electricity to us humans

　　B．they may explode easily

　　C．they may cause burns and eye injuries

　　D．they may cause fires

　　答案：C　[事实细节题。根据第五段的最后一句“Parabolic cookers can also cause burns and eye injuries if they are not used correctly.”我们可以确定本题答案为C。]

　　4．The third，fourth and fifth paragraphs mainly ________.

　　A．show how to make solar cookers

　　B．explain which is the best cooker

　　C．prove that solar cookers need improving

　　D．tell us the different making ­ups of the three kinds of solar cookers

　　答案：D　[主旨大意题。从第三、第四、第五段的内容来看，它们主要介绍了太阳能炉的三种不同的构造形式。]

　　B

　　Vacations are meant for the entire family—which means a vacation destination should offer a whole range of attractions and features that every member of the family should enjoy.Many families would say that the perfect family destination does not exist.After all，what kind of destination offers that much diversity？However，Gold Coast in Queensland，Australia may be the closest place you can ever find that fits the bill of the perfect spot for families of every size，with diverse interests.

　　For one thing，the city of Queensland is known for its amazing beaches.While not as popular as the beaches in Spain or the Caribbean，Australian beaches still do rank among the best in the world.The beaches here can prove that.If there are world­class beaches，it could only mean world­class accommodations and amenities(设施)．In turn，this means everyone in a family can easily

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