猫为什么可以爬树
<p>我家养了一只灰色的小猫，它非常可爱，每天在家里来回地奔跑，伸出它那锋利的爪子，一会儿抓住桌布爬上桌子，一会儿抓住沙发布爬上沙发，站在高高的沙发靠背上，看着我“喵，喵”叫，好像在说：“看，我多棒呀！”</p><p><span word="My">My</span> <span word="family">family</span> <span word="has">has</span> <span word="a">a</span> <span word="gray">gray</span> <span word="kitten">kitten</span>. <span word="It">It</span>'<span word="s">s</span> <span word="very">very</span> <span word="cute">cute</span>. <span word="Every">Every</span> <span word="day">day</span>, <span word="it">it</span> <span word="runs">runs</span> <span word="back">back</span> <span word="and">and</span> <span word="forth">forth</span> <span word="at">at</span> <span word="home">home</span>, <span word="stretches">stretches</span> <span word="out">out</span> <span word="its">its</span> <span word="sharp">sharp</span> <span word="claws">claws</span>, <span word="grabs">grabs</span> <span word="the">the</span> <span word="tablecloth">tablecloth</span> <span word="and">and</span> <span word="climbs">climbs</span> <span word="on">on</span> <span word="the">the</span> <span word="table">table</span>, <span word="grabs">grabs</span> <span word="the">the</span> <span word="sofa">sofa</span> <span word="cloth">cloth</span> <span word="and">and</span> <span word="climbs">climbs</span> <span word="on">on</span> <span word="the">the</span> <span word="sofa">sofa</span>, <span word="stands">stands</span> <span word="on">on</span> <span word="the">the</span> <span word="back">back</span> <span word="of">of</span> <span word="the">the</span> <span word="high">high</span> <span word="sofa">sofa</span>, <span word="looks">looks</span> <span word="at">at</span> <span word="me">me</span> "<span word="meow">meow</span>, <span word="meow">meow</span>", <span word="as">as</span> <span word="if">if</span> <span word="to">to</span> <span word="say">say</span>: "<span word="look">look</span>, <span word="how">how</span> <span word="wonderful">wonderful</span> <span word="I">I</span> <span word="am">am</span>!"</p><p>猫能在树上行动自如。当狗追逐时，猫会爬上树来躲避狗的追逐。猫之所以能快速地爬上树，是因为它有四只爪子，每一只爪子上都有像梅花一样的肉垫，每掌有6瓣，前四瓣呈弧形，每一瓣上面都有象钩子一样的指甲，而中间一瓣没有指甲。平时指甲缩进肉垫之间的缝里，看不见，当捕捉猎物或抓东西时，就伸出来，稳稳地抓住目标，因此，能迅速地爬上树。</p><p><span word="A">A</span> <span word="cat">cat</span> <span word="can">can</span> <span word="move">move</span> <span word="freely">freely</span> <span word="in">in</span> <span word="a">a</span> <span word="tree">tree</span>. <span word="When">When</span> <span word="the">the</span> <span word="dog">dog</span> <span word="chases">chases</span>, <span word="the">the</span> <span word="cat">cat</span> <span word="climbs">climbs</span> <span word="the">the</span> <span word="tree">tree</span> <span word="to">to</span> <span word="avoid">avoid</span> <span word="the">the</span> <span word="dog">dog</span>'<span word="s">s</span> <span word="chase">chase</span>. <span word="The">The</span> <span word="reason">reason</span> <span word="why">why</span> <span word="the">the</span> <span word="cat">cat</span> <span word="can">can</span> <span word="climb">climb</span> <span word="up">up</span> <span word="the">the</span> <span word="tree">tree</span> <span word="quickly">quickly</span> <span word="is">is</span> <span word="that">that</span> <span word="it">it</span> <span word="has">has</span> <span word="four">four</span> <span word="claws">claws</span>, <span word="each">each</span> <span word="claw">claw</span> <span word="has">has</span> <span word="a">a</span> <span word="meat">meat</span> <span word="pad">pad</span> <span word="like">like</span> <span word="a">a</span> <span word="plum">plum</span> <span word="blossom">blossom</span>, <span word="each">each</span> <span word="palm">palm</span> <span word="has">has</span> <span word="six">six</span> <span word="petals">petals</span>, <span word="the">the</span> <span word="first">first</span> <span word="four">four</span> <span word="petals">petals</span> <span word="are">are</span> <span word="arc">arc</span>-<span word="shaped">shaped</span>, <span word="each">each</span> <span word="petal">petal</span> <span word="has">has</span> <span word="nails">nails</span> <span word="like">like</span> <span word="hooks">hooks</span>, <span word="and">and</span> <span word="the">the</span> <span word="middle">middle</span> <span word="one">one</span> <span word="has">has</span> <span word="no">no</span> <span word="nails">nails</span>. <span word="Usually">Usually</span>, <span word="the">the</span> <span word="nails">nails</span> <span word="are">are</span> <span word="indented">indented</span> <span word="into">into</span> <span word="the">the</span> <span word="seams">seams</span> <span word="between">between</span> <span word="the">the</span> <span word="meat">meat</span> <span word="pads">pads</span>, <span word="and">and</span> <span word="can">can</span>'<span word="t">t</span> <span word="be">be</span> <span word="seen">seen</span>. <span word="When">When</span> <span word="catching">catching</span> <span word="prey">prey</span> <span word="or">or</span> <span word="catching">catching</span> <span word="things">things</span>, <span word="they">they</span> <span word="stretch">stretch</span> <span word="out">out</span> <span word="and">and</span> <span word="stably">stably</span> <span word="grasp">grasp</span> <span word="the">the</span> <span word="target">target</span>. <span word="Therefore">Therefore</span>, <span word="they">they</span> <span word="can">can</span> <span word="quickly">quickly</span> <span word="climb">climb</span> <span word="up">up</span> <span word="the">the</span> <span word="tree">tree</span>.</p>
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