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【命题意图】本组题以等高线地形图为背景，考查地形剖面图的绘制方法和水库建设对环境的影响，考查考生的地理实践力和人地协调观等学科核心素养。15.D【解析】水库蓄水后，下游径流量减小，泥沙在库区大量沉积，出库径流量和泥沙含量大幅下降，①错误，③正确：受水库调蓄作用影响，下游水位变化幅度减小，②错误：库区水体深度大，底部水温季节变化减小，甲处河水从大坝底部排出，受库区水温的影响，年温差变小，④正确。故选D项。16.B【解析】如下图所示，左边三角所示处应高于300米，或低于200米，右边三角处为火山口，应低于两侧。故选B项。(米)600500400300200过方法技巧判读地形剖面图的技巧一看端点。在等高线地形图上，根据等高线数值和等高距大小，读出剖面线两端点的海拔（范围）。二看极值。在等高线地形图上，读出剖面线经过区域的最大值或最小值（范围）。三看拐点（弯曲）。根据拐点判断沿剖面线地势的起伏状况。四看疏密。在等高线地形图上，等高线稀琉表示坡度缓，等高线密集表示坡度陡，等高线间隔相等表示坡度均匀。

One possible version:Last Saturday,our school held an activity themed "Sports Make Us Happy".That day,all Senior 3students gathered on the playground at 8:30 am.After an inspirational opening ceremony,all kinds ofsports events started one after another.Some played basketball,football,badminton or volleyball;otherswere running or jumping.The whole playground was alive with excitement.The winners were awardedfruits and vegetables,which added to their delight.As a participant,I think highly of the activity because it not only allows us students to relax in astressful school life but also prepares us for the future both physically and mentally.I hope such activitycan be held regularly.