First, like the population of humans in this region of the world, the skin of the grass mouse contains lots of melanin, or dark pigment. Second and quite unusual, this mouse has a layer of melanin pigmented tissue between its skull and skin.
This unique cap provides an extra measure of protection for the grass mouse and three other types of African mouse, like rodents that are active during the day.
The only other specie scientists have identified with the same sort of skull adaptation is the white tent-making hat of the Central American tropics. Although these bats sleep during the day, they do so curled up with their head exposed to the sun.
What is the speaker mainly discussing?
A.The adaptations of the African grass mouse to its environment.
B.The sleeping habits of the African grass mouse.
C.The effect of intense sunlight on the diet of the African grass mouse.
D.The habitat of the African grass mouse.
第5题
对于大体积防水混凝土养护,要随时检测内外温度差,控制内外温差不大于()℃。
A.15
B.20
C.25
D.30
第8题
船用柴油机换向操纵试验时间,规定不大于______。
A.15秒
B.20秒
C.25秒
D.30秒
第9题
大体积混凝土构筑物拆模时,混凝土表面与中心、与室外的温差不超过()。
A.10℃
B.20℃
C.25℃
D.30℃
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