单项选择题 阅读下面的文字，完成14—16题。 今年以来，我国大部分地区气温起伏大、降水分布非常不均匀，气象灾害影响广、程度重。其中，江淮、江南降水异常，江西、浙江等地3月初就出现了罕见早汛。3月下旬到4月，湘江、漓江、赣江出现了超警戒水位，部分地区发生洪涝。5月5日以来，江南、华南、西南地区东部等地遭遇暴雨“倾城”。对此，中央气象台首席预报员孙军解释说：“北方冷空气南下，与西南暖湿气流在长江中下游一带交汇，加强了这些地区的气流上升运动。由于这些地区中低层水汽含量非常丰富，在空气上升运动中，水汽容易凝结，成云致雨，进而形成较强降水。” 我国是多暴雨的国家，除了西北个别省、区之外，几乎都有暴雨出现。我国属于季风气候，从晚春到盛夏，北方冷空气且战且退。冷暖空气频繁交汇，彤成一场场暴雨。暴雨形成的过程相当复杂。暴雨常常是从积雨云中落下的。形成积雨云的条件是大气中要含有充足的水汽，并有强烈持久的上升运动．把水汽迅速向上输送，云内的水滴受上升运动的影响不断增大，直到上升气流托不住时，就急剧地降落到地面。积雨云体积通常相当庞大，它们排列起来，可形成100～200千米宽的雨带。大气的运动和流水一样，常产生波动或涡旋。当两股来自不同方向或不同温度、湿度的气流相遇时，就会产生波动或涡旋。大的这几千千米，小的只有几千米。在这些地区，波动常伴随气流运行出现上升运动，并使水平方向的水汽迅速向同一地区集中，形成暴雨中心。此时，低层空气暖而湿，上层空气冷而干，致使大气层结构处于极不稳定状态，这有利于大气中能量释放，促使积雨云充分发展。 另外，地形对暴雨的形成和雨量大小也有影响。例如，由于山脉的存在，迎风坡迫使气流上升，从而垂直运动加大，暴雨增大；而在山脉的背风坡，气流下沉，雨量就大大减小，有的背风坡的雨量仅是迎风坡的1／10。山谷的狭管作用也能使暴雨加强。比如，河南有一次特大暴雨，其中心林庄，正处在南、北、西三面环山，向东逐渐形成喇叭口的地形之中，由于这样的地形，气流上升速度增大，雨量骤增。14．下面对暴雨形成的主要条件的归纳，恰当的是哪一项?(2分) A．不同温度、湿度的气流相遇导致大气在运动中产生波动或者涡旋。 B．充足的水汽、强烈而持久的气流上升运动和大气层结构的不稳定。 C．气温起伏大、降水分布非常的不均匀，气象灾害影响广、程度重。 D．积雨云体积的大小，山脉坡向与坡度陡缓，气流上升运动的大小。

单项选择题 A.return B.adjust C.contribute D.stick

单项选择题 第二节：完型填空（共20小题；每小题1.5分，满分30分）阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。The passengers on the bus watched with sympathy as Susan made her way carefully up the steps. She paid the driver and then, using her hands to 31 the seats, settled in one of them.It had been a year since Susan became blind. As the result of an accident she was suddenly thrown into a world of 32 . Susan’s husband Mark watched her 33 into hopelessness and he was 34 to use every possible means to help his wife.Finally, Susan felt ready to 35 to her job, but how would she get there? She used to take the bus, but she was now too 36 to get around the city by herself. Mark 37 to ride the bus with Susan each morning and evening 38 she could manage it by herself.For two weeks, Mark 39 Susan to and from work each day. He taught her how to rely on her other 40 , specifically her hearing, to determine where she was and how to adapt to her new 41 .At last, Susan decided that she was ready to try the trip 42 . Monday morning arrived. Before she left, she hugged her husband 43 , her eyes filled with tears of gratitude（感激）.She said good-bye and, for the first time, they went their 44 ways. Each day went perfectly, and a wild excitement 45 Susan. She was doing it!On Friday morning, Susan took the bus to work 46 . As she was getting off the bus, the driver said, “Miss, I sure 47 you.” Curious, Susan asked the driver 48 .“You know ,every morning for the __49_week,a fine-looking gentleman in a military uniform. has been standing across the corner watching you until you enter your office building safely,” the bus driver said. Tears of happiness poured down Susan’s cheeks. She was so lucky for he had given her a gift more powerful than_50_,That is the gift of love that can bring light where there is darkness.31.A. touch B.grab C.count D.feel