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  3. Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for directing your muscles intelli

Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for directing your muscles intelli

admin2012-10-23  72
问题     Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for directing your muscles intelligently—to the exact extent necessary for each action you perform. For example,when you reach for an object,the sensory nerves linking the muscles to the brain stop your muscles in relation to the object in your muscular sense in action.
    Muscles are stringy bundles of fibers varying from one five-thousandth of all inch to about three inches. They have three unique characteristics:they can become shorter and thicker;they can stretch to their original position. Under a high-powered microscope,muscle tissue is seen as long,slender cells with a grainy texture like wood.
    More than half of a person’s body is composed of muscle fibers,most of which involuntary—in other words,work without conscious direction. The voluntary muscles,those that we move consciously to perform particular action,number more than five hundred. Women have only 60 to 70 percent as much muscle as men for their body mass. That is why an average woman can’t lift as much,throw as far,or hit as hard as an average man.
An average woman is weaker than an average man because she has_____.
选项 A、only 60 to 70 percent as much muscle for her body mass
B、more voluntary muscles than an average man
C、60 to 70 percent less muscle for her body mass
D、less muscle fiber for her body weight
答案A
解析 题目问：为什么女人比男人力气小?最后一段“Women have only 60 to 70 percent as much muscle as men for their body mass．That is why…”，通过此句话可知，女人身体内的肌肉只占男人体内肌肉的60％～70％，这就是为什么女人的力气要比男人小。据此判断，应选择A。
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