【题目】（9分）下列是利用小鼠所做的几个实验，请回答相关问题：
实验一 选择30只生理状况大致相同的健康成年小鼠，测定小鼠单位时间耗氧量的平均值，以代表小鼠的物质代谢强度，将其随机分为甲、乙两组，做如下处理：
组别 | 实验处理方法 | 实验结果 |
甲 | 切除小白鼠体内的甲状腺 | 切除10天后，测得其物质代谢强度大大下降 |
乙 | 切除小白鼠体内的甲状腺，5天后，连续给小白鼠注射一定量溶于某种溶剂中的甲状腺激素 | 切除10天后，测得其物质代谢强度没有下降 |
由此可以推测：甲状腺激素能增强__________________________。为了证明这一推论，要增加一对照实验，对照实验的处理方法是________________________________________。
实验二 已知卵巢分泌的雌性激素能促进子宫发育。研究人员为探究垂体分泌的促性腺激素对卵巢和子宫发育的影响情况，用一批幼鼠做了如下实验：
组别 | 手术/处理方法 | 相同条件下喂养一段时间后，卵巢的平均重量（mg） | 相同条件下喂养一段时间后，子宫平均重量（mg） |
1 | 不做处理 | 68 | 216 |
2 | A | 36 | 93 |
3 | 切除垂体，同时定期注射适量雌性激素 | 37 | 219 |
4 | 切除垂体，同时定期注射适量促性腺激素 | 66 | 219 |
请回答：
（1）实验所用的幼鼠性别应为____________________，且小鼠的生长发育状况和个体应大小相近，原因是________________________________________。
（2）表中A处的处理方法为________________________________________。
（3）从实验结果可以看出，促性腺激素只能影响____________________的发育，第三组实验结果产生的原因是________________________________________。
【答案】（9分，除标明外，每空1分）
实验一：小鼠的物质代谢 从切除甲状腺后的第5天开始，注射等量的用于该实验的溶剂（2分）
实验二：（1）雌性 保证单一变量
（2）切除垂体，同时注射等量溶剂
（3）卵巢
切除垂体后，促性腺激素减少，导致卵巢不能正常发育，而定期注射的雌性激素促进了子宫发育（2分）
【解析】实验一：从实验的处理方法可知，该实验的目的是探究甲状腺激素对小鼠代谢能力的影响。甲、乙两组对照说明甲状腺激素可以增强物质代谢的强度。由于甲状腺激素是溶于某种溶剂的，为了排除这种溶剂对物质代谢的影响，所以应增加一对照组，处理方法是从切除甲状腺后的第5天开始，注射等量的用于该实验的溶剂。实验二：（1）由于该实验探究的是促性腺激素对卵巢和子宫发育的影响情况，所以应选用雌性小鼠。小鼠的生长发育状况和个体大小都属于无关变量，所以要保持相近。（2）第2组实验中，小鼠的子宫和卵巢均减轻，所以该组的处理方法应是切除垂体，同时注射等量溶剂。（3）第4组实验和第3组实验相比，小鼠的卵巢重量较大而子宫重量一致，说明了促性腺激素只影响卵巢的发育。第3组实验中因为切除了垂体，所以促性腺激素减少，导致卵巢重量变轻，但注射了适量的雌性激素，所以子宫发育正常。
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The study found the most trees cover in South America. 2 . North Africa and West Asia have the least.
The study found that climate conditions alone could not explain the amount of trees cover in different areas. 3 . There are areas with few trees but also few people, and areas with many trees and many people. The findings suggest that things like land rights, markets or government policies can influence tree planting and protection.
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