<div style="layout-grid:;
"><div style="text-align: center;"><strong>2012学年度上学期小学单元学习水平评价</strong></div><div style="text-align: center;"><strong><br></strong></div><div style="text-align: center;"><strong>四年级数学（2）</strong></div><br><span>学校</span><span style=" text-decoration:underline ; "> </span><span> 四年</span><span style=" text-decoration:underline ; "> </span><span>班 学号</span><span style=" text-decoration:underline ; "> </span><span> 姓名</span><span style=" text-decoration:underline ; "> </span><span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px;"><br></span><br><strong><span>内容：</span><span>角的度量</span></strong><br><br><span>全卷100分 答卷时间：</span><span>60分钟</span><br><br><strong><span>一、填空</span><span>（共29分）</span></strong><br><br><span>1．</span><span>把线段的一端无限延长，可以得到一条（ ），它只有一个（ ）。（2分）</span><br><br><span>2．由一点引出两条（ ）线所组成的图形叫做（ ）。这一点是角的</span><span>（ ），这两条射线是角的（ ）。（4分）</span><br><br><span>3</span><span>．</span><span>角的大小要看两边叉开的（ ），叉开得（ ），角越大。角的大小与两边的长短（ ）关系。（3分）</span><br><br><span>4</span><span>．</span><span>1个平角=（ ）个直角；一个周角可以分成（ ）个60</span><span>°的角。（2分）</span><br><br><span>5</span><span>．</span><span>小于90°的角叫做（ ）；大于90°而小于180°的角叫（ ），等于90°的角叫做（ ）。（3分）</span><br><br><span>6．将一张圆形纸片对折</span><span>3次后，折成的角是（ ）度。</span><span>（2分）</span><br><br><span>7</span><span>．</span><span>3时整，时针与分针成（ ）角；6时整时针与分针成（ ）角</span><span>。</span><span>（2分）</span><br><br><span>8</span><span>．</span><span>把下面角的度数填入适当的括号内。（8分）</span><span></span><br><br><span>30° 125° 65° 89° 100° 127° 1°</span><span> </span><span>179°</span><br><br><span>锐角（ ） 钝角（ ）</span><br><br><span>9．</span><span>一副三角板有2块。其中一块三角板三个角的度数分别是（ ）、（ ）和（ ），另一块三角板三个角的度数分别是（ ）、（ ）和（ ）。</span><span>（3分）</span><br><br><strong><span>二、判断题</span><span>（对的在括号里打“T”，错的打“F”）（5分）</span></strong><br><br><span>1</span><span>．直线比射线长。 </span><span>（ ）</span><br><br><span>2</span><span>．角的两边画得越长，这个角就越大。 </span><span>（ ）</span><br><br><span>3</span><span>．钝角都大于</span><span>90°。 （ ）</span><br><br><span>4</span><span>．</span><span>1分钟，分针好转动了一个周角。 （ ）</span><br><br><span>5</span><span>．用一副三角板可以拼出</span><span>105°的角。 （ ）</span><br><br><strong><span>三、选择正确答案的字母编号填在括号里</span><span>（5分）</span><span></span></strong><br><br><span>1</span><span>．</span><span>过一点能画（ ）条直线，过两点只能画（ ）条直线。</span><span></span><br><br><span>A</span><span>．</span><span>1 B</span><span>．</span><span>2 C</span><span>．无数</span><br><br><span>2</span><span>．</span><span>一条（ ）长10厘米。</span><span></span><br><br><span>A</span><span>．线段 </span><span>B</span><span>．直线 </span><span>C</span><span>．射线</span><br><br><span style=" z-index:1; left:0px; "></span><span>3</span><span>．</span><span>周角的二分之一是（ ）。</span><span></span><br><br><span>A</span><span>．</span><span>60° B</span><span>．</span><span>90° C</span><span>．</span><span>180°</span><span></span><br><br><span>4</span><span>．</span><span>右图中，如果∠1是直角，那么∠2和∠3都是（ ）</span><span><img src="//www.szxuexiao.com/uploadimages/2012/1122/2012112213156.png?m=0.8046710507478565"></span><br><br><span>A</span><span>．锐角 </span><span>B</span><span>．直角 </span><span>C</span><span>．钝角</span><br><br><span>5</span><span>．</span><span>把平角分成两个角，其中一个角是锐角，那么另一个角一定是（ ）。</span><br><br><span>A</span><span>．钝角 </span><span>B</span><span>．直角 </span><span>C</span><span>．锐角</span><br><br><strong><span>四、以下度数的角可以由一副三角板的哪些角的度数拼出，请填写等式</span><span>（8分）</span></strong><br><br><img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131547.jpg?m=0.7482983684167266"></div><div style="layout-grid:;
"><br><strong><span>五、辩一辩，下面的角是哪一种角？</span><span>（10分）</span></strong><br><br><img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131629.jpg?m=0.02446768688969314"><br><br><strong><span>六、量出图中各角的度数</span><span>（8分）</span></strong><br><br><span style=" z-index:1; left:0px; "></span><img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131715.jpg?m=0.6779090873897076"><br><br><strong><span>七、用量角器分别画出50°，160°和115°的角</span><span>（9分）</span></strong><br><br><br><strong><span>八、</span><span>数</span><span>一</span><span>数</span><span>（共12分）</span><span></span></strong><br><br><span>1</span><span>．下图中各有几个角？（</span><span>6分）</span><br><br><span style=" z-index:1; left:0px; "></span><img src="//www.szxuexiao.com/uploadimages/2012/1122/2012112213188.jpg?m=0.3810287653468549"><br><br><span>2．下图中有几条线段。（6分）</span><br><br><span style=" z-index:1; left:0px; "></span><img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131840.jpg?m=0.577769891358912"><br><br><strong><span>九、看图计算</span><span>（共14分）</span></strong><br><br><span style=" z-index:1; left:0px; "></span><span>1．已知∠1 = 20° （3分） </span><br><br><span> 那么∠2 = </span><span style=" text-decoration:underline ; "> <img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131918.png?m=0.3796152463182807"></span><span style=" text-decoration:underline ; "></span><br><br><span style=" z-index:1; left:0px; "></span><span><br></span></div><div style="layout-grid:;
"><span>2．已知∠1 = 30°，∠3 = 60° （5分）</span><br><br><span> 那么∠2 =</span><span style=" text-decoration:underline ; "> </span><br><br><span> ∠2 是一个（ ）角。<img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122131949.png?m=0.059771383879706264"></span><br><br><br><span>3．已知∠1 =140° （6分）</span><br><br><span style=" z-index:1; left:0px; "></span><span> 那么∠2 =</span><span style=" text-decoration:underline ; "> </span><br><br><span> ∠3 =</span><span style=" text-decoration:underline ; "> </span><span style=" text-decoration:underline ; "></span><br><br><span> ∠4 =</span><span style=" text-decoration:underline ; "> </span><span> <img src="//www.szxuexiao.com/uploadimages/2012/1122/20121122132015.png?m=0.8023531269282103"></span><br></div>
四年级上