题目

某种昆虫靠翅膀振动发声如果这种昆虫的翅膀在10s内振动了5000次，则它振动的频率是__Hz，人类__听到这种声音选填“能”或“不能”． 答案：【答案】 500 能【解析】昆虫的翅膀在10s内振动了5000次，则它振动的频率；人类能听到的频率范围是20Hz～20000Hz．500Hz在人类能听到的频率范围内，所以能听到．故答案为：500；能．短文填空。（共10小题，每小题1分，满分10分）阅读短文，并选择方框中的词用适当形式填空，每个词最多选用一次，有一项是多余的，每空一词。with that little start do because way how make explain badSometimes, we see some people reading books while biting their nails (咬指甲). According to the BBC(英国广播公司), up to 45 percent of teenagers bit their nails. There is not an exact answer to 【1】 why people bite their nails. But most commonly, nail biting is said to be a nervous habit. It is done 【2】 of stress(压力), boredom or excitement.What’s more, a report says that people with higher levels of intelligence(智力) 【3】 biting their nails at an early age. It believes that compared 【4】 common person, 【5】 with higher levels of intelligence may feel higher levels of stress more easily.This habit is 【6】 for the biters. It can give them red or sore fingertips. And long-term nail biting can affect(影响) 【7】 nails grow.But don’t worry! There are many 【8】 to stop biting your nails. First, keep your nails clean. The more you focus on taking care of your nails, the 【9】 likely you may bite them again. Also, when you feel stressed, try to relax. 【10】 exercise or having a warm bath both help.