Key:
　　1．C 2．C 3．B 4．D 5．D 6．A 7．A 8．A 9．C 10．B 11．D 12．A 13．D 14．1 2 3
　　题目解析：
　　1．Which of the following can be inferred from paragraph 1 about the ground that we walk on?（Inference Question）
　　A．It cannot hold rainwater for long periods of time．
　　B．It prevents most groundwater from circulating．
　　C．It absorbs most of the water it contains from rivers．
　　D．It has the capacity to store large amounts of water．
　　相关原句：At first thought it seems incredible that there can be enough space in the “solid” ground underfoot to hold all this water．（Paragraph 1）
　　本题解析：文中指出地下居然能储存这麽多水是不可思议的，也就是说地下可以存储大量水，因此选择D。
　　正确答案：D
　　2．The word “incredible” in the passage is closest in meaning to （Vocabulary Question）
　　A．Unbelievable
　　B．Comforting
　　C．Confusing
　　D．Interesting
　　相关原句：At first thought it seems incredible that there can be enough space in the “solid” ground underfoot to hold all this water．（Paragraph 1）
　　本题解析：incredible意为“不可思议的”，即“难以相信的（unbelievable）”，因此选择A。
　　正确答案：A
　　3．The word “out of sight” in the passage is closest in meaning to （Vocabulary Question）
　　A．Far away
　　B．Partly visible
　　C．Hidden
　　D．Discovered
　　相关原句：Beds of this material, out of sight beneath the soil, are common．（Paragraph 2）
　　本题解析：Out of sight意为“看不见的”，文中指被土壤掩盖了的，即“藏起来的（hidden）”，因此选择C。
　　正确答案：C
　　4．According to paragraph 2, where is groundwater usually found?（Factual Information Question）
　　A．Inside pieces of sand and gravel
　　B．On top of beds of rock
　　C．In fast rivers that are flowing beneath the soil
　　D．In spaces between pieces of sediment
　　相关原句：The commonest spaces are those among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel．（Paragraph 2）
　　本题解析：第二段指出最普遍的地下水存储空间在于疏松土壤和沙石间的空隙，因此选择D。
　　正确答案：D
　　5．The phrase “glacial outwash” in the passage refers to （Reference Question）
　　A．Fast rivers
　　B．Glaciers
　　C．The huge volumes of water created by glacial melting
　　D．The particles carried in water from melting glaciers
　　相关原句：The water was always laden with pebbles, gravel, and sand, known as glacial outwash, that was deposited as the flow slowed down．（Paragraph 2）
　　本题解析：“glacial outwash”指的即是河水所承载的鹅卵石、沙石和沙子等，因此选择D。
　　正确答案：D
　　6．All of the following are mentioned in paragraph 3 as places that sediment-laden rivers can deposit their sediments EXCEPT（Negative Factual Information Question）
　　A．A mountain valley
　　B．Flat land
　　C．A lake floor
　　D．The seafloor
　　相关原句：…wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows…（Paragraph 3）
　　Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first…（Paragraph 3）
　　本题解析：本段指出了三处沉积物沉淀的地点：平地（flat land），湖床（a lake floor），海床（the seafloor）。山谷（mountain valley）是沉淀物的来源地，不是沉淀地点，因此选择A。
　　正确答案：A
　　7．The word “overlie” in the passage is closest in meaning to （Vocabulary Question）
　　A．Cover
　　B．Change
　　C．Separate
　　D．Surround
　　相关原句：In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil;（Paragraph 4）
　　本题解析：overlie意为“叠加、覆盖”，与cover同义，因此选择A。
　　正确答案：A