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Cats have the widest hearing range of nearly any mammal”not only can they perceive sound in what we define as the “ultrasonic” range, they can also appreciate all the bass Dr Dre can throw at them. They can swivel their whiskers forwards while hunting to provide a kind of short-range radar.And they can see exceptionally well in the dark thanks to a reflective surface behind the retina that bounces lightback, giving it a second chance to hit a photoreceptor. They see more distinct images per second than we do.
Dog partisans will appeal to the dog’s allegedly superior intelligence — though if that were the primary criterion for choosing a pet, one would expect to see a lot more crows and squid on leads around town. In fact, cats are rather cleverer than commonly assumed, as the biologist and animal-behaviour expert John Bradshaw shows in his new book.They can even be trained to an extent which was news to me Bradshaw’s book mixes pellets of cat lore with accounts of feline evolution, anatomy, genetics and development from newborn kitten to adulthood, plus descriptions of cat-psychology experiments in the laboratory, many of which he has conducted himself. Some of the most interesting parts indicate holes in our current scientific knowledge. “Many mother cats try to move their litters at least once before they wean them,” he observes, “but science has yet to find out why”. No one knows why cats go crazy for catnip, nor why they are able “to classify shapes according to whether they are closed or open.” Kittens, meanwhile, “may also use special movements of their tails to signal playfulness, but so far no scientist has been able to decode these”. As far as potential research projects go, decoding the tail-language of playing kittens must be about the interesting unsolved problem in science.
The cat is an apparently phlegmatic beast, but Bradshaw points out that cats experience strong emotions, and sometimes might be suffering in silence. They aren’t part
本题可定位到第三段。另外三项在本段也有涉及，但根据最后一段可知 B 项正确。
《义务教育数学课程标准（2011年版）》强调，课程内容要反映社会的需要、数学的特点，要符合学生的认知规律。课程内容的组织要重视过程，处理好（）的关系。
设α是某一方程组的解向量，k为某一常数，则kα也为该方程组的解向量。（ ）
案例：
在有理数运算的课堂教学片段中，某学生的板演如下：
针对该学生的解答，教师进行了如下教学：
师：请仔细检查你的演算过程，看是否正确无误？
生：好像正确吧。
请分析例题1、例题2中每一步运算的依据。（10分）
初中数学课程是一门国家课程，其主要内容包括课程目标、教学内容、教学过程和( )等
教师职业道德区别于其他职业道德的显著标志就是（ ）。
对高中数学的评价，下列说法错误的是( )。
