Given an English text, write a function count_len to count the frequencies of words of given length. The test string is 'Life is short, you need Python', count_len(4) will return 2. 定义函数 count_len统计输入的英文文本中参数给定长度的单词出现的次数。 输入：'Life is short, you need Python.' count_len(5) 输出：1 count_len(4) 输出：2

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?

which of the following is not an effect of technology on farming?

the correct answer is: it makes farmers perform more tasks by hand for apex.