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大家早上好~！本听力材料来自于老托partb，partc，是公认实施有效的听写材料，对于上手托福时间不长的同学非常适合。我曾经一次短时间备考听力提高了7分也归功老托。希望大家和我一样一定要坚持下来噢。相信坚持学习的同学听力上都会有很大的飞跃！
Nopain, no gain.我们的安排是这样的，第一遍用听力软件精听材料（建议做单句听写，听写的时候不要偷看我给的挖空题），然后按照我给的挖空题填关键词，回复后即可看到听力原文和文章精解，我将把难点和易错点oneby one 分析给大家。
回复填空答案格式如下：1____2____3____...et.al.
Human populations near the equator haveevolved dark skin over many generations because of exposure to the fierce raysof the Sun. A similar phenomenon has also occurred in other parts of the animalkingdom. The African grass mouse is a good example. Most mice are______,but the African grass mouse is active during daylight hours. This means that itspends its days searching for food in the semidry bush and______habitats of eastern andsouthern Africa. Its______is______, like a______, which helps it blend in withits environment. Because it spends a lot of time in the intense______sun, the grass mouse has also evolved two separate safeguards against the Sun's______radiation. First, like the populations of humans in this region of the world,the skin of the grass mouse contains lots of______, or dark______. Second, and quite unusual,this mouse has a layer of melanin-pigmented______between its______and skin. This unique "cap" provides an extra measure of protectionfor the grass mouse and three other types of African mouse-like rodents thatare active during the day. The only other species scientists have identifiedwith the same sort of skull adaptation is the white tent-making bat of theCentral American tropics. Although these bats sleep during the day, they do socurled up with their heads exposed to the sun.
