【题目】阅读图文资料，完成下列要求.
材料：河流的侵蚀、沉积及沼泽的吸收（附）影响河流泥沙和营养物质含量，水体中营养物质含量影响浮游生物量，与水温共同制约鱼类资源数量。图7所示的西西伯利亚平原地势低平，冻土发育，沼泽广布。
（1）分析西西伯利亚平原沼泽广布的原因
（2）分析叶尼塞河泥沙含量较多，而鄂毕河泥沙含量较少的原因。
（3）通常，大河河口的鱼类资源丰富，但鄂毕河河口鱼类资源相对较少。说明鄂毕河河口鱼类资源较少的原因。
【答案】（1）地势低平，排水不畅；气温低，蒸发量小；下部土层冻结（永冻层），阻滞水分下渗；（凌汛等导致）河水泛滥。（8分）
（2）叶尼塞河支流多流经中西伯利亚高原，（河床比降大）流速快，侵蚀强，增加了河流含沙量。鄂毕河主要流经平原，流速慢，泥沙沉积，含沙量小。（4分）
（3）鄂毕河河口区纬度高，水温低，鱼类生长慢。结冰期长，鱼类存活率偏低。鄂毕河流经沼泽，营养物质被植物吸收，河水中营养物质严重缺乏，不利于浮游生物生长。北冰洋营养物质和饵料较为贫乏。（4分，两点满分）
【解析】
试题分析：
（1）西西伯利亚平原沼泽广布的原因，可以从降水、蒸发、排水、植被、冻土等方面回答。
（2）叶尼塞河泥沙含量较多，而鄂毕河泥沙含量较少的原因，可以从流域面积、植被、支流等方面回答。
（3）鄂毕河河口鱼类资源较少的原因，可以从含沙量。饵料、冰期、存活率等方面回答。
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File Created
DELAYED BAGGAGE REPORT
PRINTED AT ALBANY N.Y. AIRPORT ON JULY 10, 2016 11:15 A.M.
Dear Valued Customer,
We regret that your baggage was not available to claim after your recent flight. Everything possible will be done to locate your belongings and return it to you on time.
For information on your delayed baggage, contact the United Airlines Baggage Resolution Center at its 24 hour, seven days a week.
Number:
1-800-335-BAGS (2247) (US – Toll Free)
281-821-3536 (Local Houston Number)
Or visit site: http://www.united.com/for/bagtracing
As soon as you send your Delayed Baggage Report, United Airlines will begin to look carefully for your baggage system. Our Baggage Resolution staff will make every effort to call you once a day to keep you updated on our progress. Please refer to the File Reference Number on this receipt (凭证) when corresponding or calling so that we can quickly access your records.
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DELAYED BAGGAGE REPORT
DELAYED BAGGAGE REPORT FILE REFERENCE: ALBUA25876
Name: JOHN JACKSON Contact Number: 802-247-9999
Delivery Address: 66 MOONBROOK DR
BRANDON Email: minminvt@yahoo.com
VERMONT USA 05745
Bag Tag: 0037387643; /span>0037387657
Description: Soft-Side Upright suitcase; Non-Zippered, hard side horizontal suitcase
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