Question

A man steps on what seems like solid ground but discovers with horror that the ground is giving way beneath his feet．The man struggles desperately, but he is trapped．He cannot escape．Slowly he sinks deeper and deeper until at last he is gone, buried in the treacherous earth．The solid ground is solid only in appearance．It is actual quicksand, which is a deep mass of fine sand mixed with water． 　　How is quicksand formed?Water pushes up from below the surface and is held by the sand．The grains of sand are forced apart by the water．They cannot hold any weight．The surface water may have come from a spring, a river or a stream．Sometimes pools of water near beaches become filled with sand．When the soil under these pools does not allow for good drainage(排水), the sand can become stretches of quicksand． 　　Is it true that a man who steps into quicksand is doomed to(注定)die?No, for men have fought their way from quicksand to firm land again．It is panic(恐慌)that creates the condition that can result in death, for the more a person struggles, the worse matters become．Quick movements will make the sand give way temporarily(临时地), but then it rushes and settles solidly around the body．A man trapped in quicksand should either lie back, or not move at all, except to stretch out his arms．When the weight of the sand his body has displaced equals his weight, he will stop sinking．With feet held still, and with slow movements of the arms, as in the backstroke in swimming men have managed to roll to safety and reach firm ground． (1) Which statement is NOT true according to the passage? [　　] A． It is hard to tell quicksand from solid ground． B． Quicksand appears to be solid． C． Quicksand is always far off beaches． D． Quicksand is a deep mass of fine sand mixed with water． (2) When you are trapped in quicksand, first of all you should ________． [　　] A． cry for help B． quickly begin to struggle hard to get out C． try your best to push sand away D． keep calm (3) A person stops sinking when the weight of his body is ________ that of the sand his body has displaced． [　　] A． greater than B． the same as C． near to D． close to (4) Men have managed to reach firm ground by ________． [　　] A． holding feet still and moving arms slowly B． lying back calmly C． keeping still and stretching out arms D． swimming quickly

Answer 1

答案：1．C;2．D;3．B;4．A;
解析：

(1)	此题应选错误的选项。根据第一段内容可知A、B、D项正确。
(2)	文章最后一段第三句讲：恐慌导致身陷淤泥的人死亡，由此可知keep calm即保持冷静最为关键，A、B、C项与最后一段矛盾。
(3)	文章最后一段倒数第二句讲：当身体的重量与泥沙的承受力相同时，人不再下陷，所以选B项。
(4)	由文章倒数第三句“A man trapped in quicksand should either lie back，or not move at all，except to stretch out his arms，”可知双腿不可以动，只能轻轻移动胳膊，所以选A项。