第三节One possibleversionParagraph 1He was determined to protect the flowers. So he built ahigh wall around them. Not feeling satisfied, he even setup rules as to who could enter the garden, how they mustenter,and what they must follow while they were there.Asa result, children were forbidden to enter and appreciatethe flowers as before. For his part, he continued to see to itthat his treasure received enough sunlight and water so thatthe flowers continued to perform their wonderful magicParagraph 2Hethe flowers seemed to fade day by day,so theman went everywhere for help. He visited every expert, onlyto find his efforts in vain. He felt on pins and needles, see-ing his beloved flowers dying. One evening, he was wan-dering on the street aimlessly when he suddenly noticed theflower woman on the same spot where he had met her, giving away her amazing flowers. It finally dawned on him thatthe flowers are gifts not passessions and that only by sharingcan the magic remain and last

1.(1分)(1)间接直接(2)五点年龄组成采伐或利用或开发利用(3)DCE能量流动逐级递减,营养级越高,所获得的能量越少,所以不足以维持数量较多生物的生存(2分,答出能量传递特点1分,答出F位于食物链顶端,获得能量少1分)(4)随机(5)可引起林场生物多样性的改变。适度砍伐后,形成林窗,会改变林场局部原有的环境(阳光、通风、湿度等),从而引起林场物种的变化。适当砍伐形成的林窗可因上述改变,增加林场生物多样性(2分,答岀生物多样性改变或増加分,筌岀原因1分)

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