题目

人体的肌肉主要是有蛋白质构成的，但是骨骼肌、心肌、平滑肌的功能各不相同，这是由于（ ） A．肌细胞形状不同B．在人体的分布部位不同C．控制它们运动的神经不同D．构成肌细胞的蛋白质分子结构不同 答案：D 完形填空 　　There are many kinds of pollution around us, 　　1　　 air pollution, soil pollution, noise pollution and light pollution．They are bad 　　2　　 our health in many ways． Burning gas, oil and coal creates air pollution．It can cause sore eyes and 　　3　　 problems． 　　With the increase of pollution and the development of industry, litter is everywhere．It makes our environment dirty．People put lots of rubbish in the land．Farmers use too many 　　4　　 in the fields．They destroy the soil．So soil pollution has become serious． 　　Noise pollution can make people 　　5　　．For example, people may lose their hearing if they work in a 　　6　　 place for a long time．Too much noise can cause high blood pressure 　　7　　． 　　Working for a long time in strong, changeable light 　　8　　 cause some kinds of illnesses．It makes people feel 　　9　　 and is especially bad for the eyes． 　　With 　　10　　 pollution, our planet will become greener and our health will be better．Let’s be greener people． (1) [　　] A． such as B． for example C． as well as D． because of (2) [　　] A． to B． in C． for D． of (3) [　　] A． breath B． breathe C． breathed D． breathing (4) [　　] A． chemical B． chemicals C． chemist D． chemistry (5) [　　] A． blind B． lame C． deaf D． healthy (6) [　　] A． noise B． noisy C． quiet D． quietly (7) [　　] A． as well B． too C． also D． either (8) [　　] A． must B． need C． should D． may (9) [　　] A． comfortable B． possibly C． terrible D． terribly (10) [　　] A． little B． less C． few D． fewer