题目

平行四边形 ABCD中，BC＝14 ，BD＝3AC，设AC＝x，则x的取值范围是，平行四边形ABCD面积的最大值是． 答案：【1】7＜x＜14【2】147第三部分 阅读理解（共20小题；每小题2分，满分40分）阅读下列短文，从每题所给的四个选项（A、B、C和D）中选出最佳选项，并在答题卡上将该项涂黑。A flock of hungry pigeons were flying across the sky in search of food. Having traveled a long distance, they felt tired and settled down on a tree. Just below the tree, they saw grains strewn（抛洒）all over the ground. The pigeons were happy to have found enough food to eat. All the pigeons came down from the tree and started eating the grains. As they were doing so, a huge net fell on them and trapped them all.The pigeons were taken aback. They noticed a hunter sitting at a distance from the tree, a bow and arrow in hand. The pigeons realized it was the hunter who had trapped them in the net. The hunter got up and began to move towards the pigeons.The leader of the pigeons spoke,“ Friends, we are in great trouble. The hunter will catch us if we do not act swiftly in a few seconds. There is only one option available at this moment. Let all of us use our force together and fly up along with the net. If all of us use our force and fly together, we can fly carrying the net along with us. Let us start now.”All the pigeons agreed with him and flew high carrying the net along with them, After traveling enough distance away from the hunter, the pigeons settled on a tree and carefully came out of the net one by one and thus escaped the evil design of the hunter.56. Who strewed the grains over the ground? A. A villager.      B. The hunter.       C. The pigeon owner.  D. The writer.57. The word “_________” has the closest meaning to the underlined word “option“. A. reason         B. choice           C. action            D. opinion58. How did the pigeons react when they got trapped? A. They didn’t know what to do.         B. They tried to fly in all directions. C. They remained rather calm.           D. They decided to fight for their lives.59. This story wants to tell us that ________. A. two heads are better than one         B. confidence will save everyone C. teamwork can work wonders          D. actions speaker louder than words