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d by diseases.67.The layer of soil that provides necessary nutrients for plant growth is called.A.1itter B.topsoil C.humus D.subsoil68.According to the text.which of the following is NOT true?A.Soil forms from weathered rock on the earth surface.B.The deeper layer of soil is darker in colour than t}le surface soil.C.Air pollution is partially responsible for acid soil.D.Groundwater tends to carry away nutrients for plant growth.69.We can infer from the passage that the water table lies .A.between the topsoil layer and the subsoil layerB.in the subsoil layer above bedrockC.between the subsoil layer and bedrockD.in the bedrock layer beneath the subsoil70.The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are .A.rushed away into the riverB.cleaned and purified by waterC.destroyed and carried away by waterD.mixed with water and bee part of itBDHolidaysHoliday News Vacations(空位) now and in the school holidays at a country hotel in Devon. This fortable, friendly homefromhome lies near the beautiful quiet countryside, but just a drive away from the sea. The food is simple but good. Children and pets are wele. Reduced prices for low season.The Snowdonia Centre The Snowdonis Centre for young mountain climbers has a mountain climbingLesson. The beginners’costs are 57 for a week, including food and rooms. Equipment is included except walking shoes, which can be hire at a low cost.You must be in good health and prepared to go through a period of body exercises. This could be the beginning of a lifetime of mountain climbing adventure. The world Sea Trip of a Lifetime Our Wirld Sea Trip of 2008 will be unlike any holiday you have ever been on before.Instead of one hotel after another, with all its packing and unpacking, waiting and tyavelling, you just go to bed in one country and wake up in another.On board the ship, you will be well taken care of . Every meal will be firstclass and every cabin like your home.During the trip, you can rest on desk(甲板),enjoy yourself in the games rooms and in the evening dance to our musical team and watch our wonderful play. You will visit all the places most people only dream aboutfrom Acapulco and Hawaii to Tokyo and Hong Kong.For a few thousand, all you’ve ever hoped for can be yours.68. What can you do if you like to go on holidays with pets?A. Choose the holiday in Devon. B. Go to the Snowdonia Cantre.C. Join the World Sen Trip of 2008. D. Visit Acapulco and Hawaii.69. In what way is the Snowdonia Centre different from the other two holidays? provides chances of family gatherings. provides customers with good food. offers a sports lesson. offers fortable rooms.70. What is special about the World Sea Trip of 2008? can have free meals on deck every day.