2015.4.17第6周周末作业及答案

第6周homework 1答案Have you ever felt lumps under the skin on the sides of your neck when you were sick? Those might be lymph nodes. 1.They can get swollen and painful but their job is to fight infection. Lymph nodes are part of the body's defenses known as the lymphatic system.2.This complex system throughout the body makes and transports a protective fluid called lymph.3.Lymph is made of white blood cells, proteins and fats.In a patient with breast cancer, the cancer can spread to the large number of lymph nodes under the arm. 4. Doctors have traditionally removed many of these lymph nodes in the hope of removing all the cancer.But the latest research finds nothing to gain by removing so many lymph nodes. Doctors have two choices when breast cancer starts to spread. They can do what is called a sentinel node biopsy. They remove the main growth and one or 2 lymph nodes nearest to it.5.Or they can take more aggressive action and remove a lot of lymph notes.6. But that can lead to shoulder pain and permanent swelling o f the arm.第6周homework 2答案Now the Earth Policy Institute in Washington has issued a bleak warning of the risk of environmental and economic 1. chaos. Its founder Lester Brown says a push towards sustainability could help. In fact, he says, it's essential. In this week's Global Business, Peter Day hears why.Lester Brown started life as a farmer in New Jersey, the Garden State in the USA. He got some hefty degrees, worked at home and abroad for the US Department of Agriculture, and then in 1974, he founded the World Watch Institute. It became well-known for its 2. annual state of the world reports on the global environment. Years ago when I had one of our 3. periodic chats at the World Watch Institute in Washington D.C., I remember a room decked with satellite maps of the world's watershed areas. Water is still an 4.abiding theme for Lester Brown in his newer role as founder and head of the Earth Policy Institute. It's another Washington D.C. think tank designed to provide a road map for building a 5.sustainable economy.But even after so many years on the environmental beach, there's a new urgency in what Lester Brown is saying in the book World on the Edge. As an agriculturist by training, he 6.focuses on food and the new threat of food scarcity caused by natural disasters,such as the Russian drought last summer, and 7.consequential flooding elsewhere, and increasing demand for many developing countries as well as the rich world.Lester Brown thinks 8.the world has to mobilize to embrace sustainability in the waythat much of the western world mobilized to fight the Second World War.第6周homework 3答案National standards for US schools gain supportAmericans have never had national education standards. Goals for what public schools should teach are set by state and local school boards. Their members are often elected. But some Americans say the lack of national standards is wrong in a competitive global economy. Former president Bill Clinton said it was as if somehow school boards "could legislate differences in algebra or math or reading."President George W. Bush and Congress expanded federal intervention. His education law, still in effect, required states to show yearly progress in student learning as measured by the states' own tests.1.Now, the Obama administration supports what are known as the Common Core State Standards. These were developed in a year-long process led by state governors and chief state school officers. Texas and Alaska were the only states not to take part.2.The standards are in two subject areas, English-language arts and mathematics. They establish goals for each year from kindergarten through grade twelve. The aim is for students to finish high school fully prepared for college and careers.The developers considered standards in other countries, along with almost one hundred thousand public comments.3. One way the Education Department is trying to persuade states is with money. States are competing to share in almost three and a half billion dollars as part of a school reform competition. They will earn extra points in the race to the top if they approve the standards by August second.States are trying to recover from the recession. There are concerns that some could accept the standards and then lack the money to follow them.The final standards were released June second. A new report say about half the states have approved them already.4. The Thomas B. Fordham Institute is an education group in Washington. It says the standards are clearer and stronger than those used in three-fourths of the states.But the comparison also found that existing English standards are "clearly stronger" in California, Indiana and the District of Columbia.States that approve the new standards have a right to add up to fifteen percent of their own. In California, the State Board of Education plans to vote on August second to accept or reject a new set of standards. These are based largely on the common core, but also existing California standards.第3, 4周homework 1译文你生病时有没有感觉到脖子两侧的肿块？那或许就是淋巴结。

墨达哥州易旺市菲翔学校大丰刘庄镇三圩初级二零二零—二零二壹七年级语文下学期第6周周末作业1、选出以下加点字注音全部正确的一项(4分)〔〕A、两颊．〔jiá〕赫．然〔hè〕殷．勤〔yān〕恣．情〔zì〕B、褪．色〔tuì〕剔．透〔tī〕遴选〔nín〕谷穗．〔suì〕C、确凿．〔záo〕枸杞．〔qǐ〕蝉蜕〔tuì〕渺．茫〔miǎo〕D、嗫．嚅〔niè〕攒．聚〔zǎn〕寻觅．〔mì〕虐．待〔nüè〕2、以下各句中加点字的意思有误的一项为哪一项哪一项(4分)〔〕A、普少习．吏事〔熟悉〕读之竟日．．〔整天〕尝．奏荐某人为某官〔曾经〕B、普又以．其人奏〔把〕卒．用其人〔终于〕补缀．．旧纸〔修补、连接〕C、万籁．此俱寂〔声音〕亲朋无一字．〔书信〕太祖乃．悟〔就〕D、及其日中如探汤．〔热水〕孔子不能决．也〔断定〕寡．学术〔少〕3．以下句中加点成语使用不恰当的一项为哪一项哪一项(4分)()A．以梅花装饰花神庙地铁站主题墙，这一别具匠心．．．．的设计，深受好评。

B．凭借雄厚的经济实力和深沉的文化底蕴，当之无愧．．．．地获得青奥会主办权。

C．对于重要的书，我们必须常常反复阅读，每读一次都会觉得开卷有益．．．．。

D．在暑期社会理论活动中，同学们既体验到之趣，又享受了天伦之乐．．．．。

4、以下句中加点的成语使用正确的一项为哪一项哪一项〔4分〕〔〕A、在西南地区遭遇了60年不遇的特大旱灾之际，李明一家人又是捐钱，又是捐物，真可谓大方之家．．．．！B、有人以为，细节无关紧要，其实细节常常决定成败，一个细节的忽略有可能造成不堪设想．．．．的后果。

C、HY指导屡次亲临灾区视察，指示地方政府尽早做好重建工作，确保灾区人民生活安居乐业．．．．。

D、居高不下的房价已成为影响人们生活质量的沉重负担，人们要求平抑房价的呼声也一直不绝如缕．．．．。

2015-2016学年度下学期周六测试物理试卷（一）一、选择题：本题共10小题，每小题5分。

1～5题为单选题；6～10为多选题，在每个小题给出的四个选项中，至少有两个选项是正确的，全部选对的得5分，选不全的得3分，有选错或不答的得0分） 1.物体做曲线运动的条件为( ) A.物体运动的初速度不为零 B.物体所受的合外力为变力C.物体所受的合外力的方向与速度的方向不在同一条直线上D.物体所受的合外力的方向与加速度的方向不在同一条直线上2.如图所示，一节车厢沿着平直轨道以速度v 0匀速行驶，车厢内货架边放一个球，离车厢地板高为h ．当车厢突然改以加速度a 做匀加速运动时，货架上的小球将落下.小球落到地板上时，落点到货架边缘的水平距离是( ).A v .2ah B g .ah C g .ah D v g3.一条船要在最短时间内渡过宽为100 m 的河，已知河水的流速v 1与船离河岸的距离s 变化的关系如图甲所示，船在静水中的速度v 2与时间t 的关系如图乙所示，则以下判断中正确的是 ( )A ．船渡河的最短时间是25 sB ．船运动的轨迹可能是直线C ．船在河水中的加速度大小为0.4 m/s 2D ．船在河水中的最大速度是5 m/s4．A 、B 两物体通过一根跨过定滑轮的轻绳相连放在水平面上，现物体A 以v 1的速度向右匀速运动，当绳被拉成与水平面夹角分别为α、β时，如图所示．物体B 的运动速度v B 为(绳始终有拉力)( )A ．v 1sin α/sin βB ．v 1cos α/sin βC ．v 1sin α/cos βD ．v 1cos α/cos β5.物体在力F 1、F 2、F 3的共同作用下做匀速直线运动，若突然撤去外力F 1，则物体的运动情况是( )A.必沿着F 1的方向做匀加速直线运动 B ．必沿着F 1的方向做匀减速直线运动 C.可能做匀速直线运动 D.可能做直线运动，也可能做曲线运动6.对平抛运动，下列说法正确的是( )A．平抛运动是加速度大小、方向不变的曲线运动B．做平抛运动的物体，在任何相等的时间内位移的增量都是相等的C．平抛运动可以分解为水平方向的匀速直线运动和竖直方向的自由落体运动D．落地时间和落地时的速度只与抛出点的高度有关7．如图所示，一辆小车静止在水平地面上，bc是固定在小车上的水平横杆，物块M穿在杆上，M通过线悬吊着小物体m，m在小车的水平底板上，小车未动时，细线恰好在竖直方向上，现使车向右运动，全过程中M始终未相对杆bc移动，M、m与小车保持相对静止，已知a1∶a2∶a3∶a4＝1∶2∶4∶8，M受到的摩擦力大小依次为F f1、F f2、F f3、F f4，则以下结论正确的是( )A．F f1∶F f2＝1∶2 B．F f2∶F f3＝1∶2 C．F f3∶F f4＝1∶2 D．2tanα＝tanθ8.如图，从半径为R＝1 m的半圆AB上的A点水平抛出一个可视为质点的小球，经t＝0.4 s小球落到半圆上，已知当地的重力加速度g＝10 m/s2，则小球的初速度v0可能为( )A．1 m/s B．2 m/s C．3 m/s D．4 m/s9.如图所示，斜面上a、b、c、d四个点，ab＝bc＝cd，从a点以初速度为v0水平抛出一个小球，它落在斜面上的b点，若小球从a点以初2v0.水平抛出，不计空气阻力，则下列判断正确的是( ) A．小球一定落在c点B．小球可能落在d点与c点之间C．小球落在斜面的速度方向与斜面的夹角一定增大D．小球落在斜面的速度方向与斜面的夹角一定相同10.如图所示，相距l的两小球A、B位于同一高度h(l、h均为定值)．将A向B水平抛出的同时，B自由下落．A、B与地面碰撞前后，水平分速度不变，竖直分速度大小不变、方向相反．不计空气阻力及小球与地面碰撞的时间，则( )A．A、B在第一次落地前能否相碰，取决于A的初速度B．A、B在第一次落地前若不碰，此后就不会相碰C．A、B不可能运动到最高处相碰D．A、B一定能相碰二、实验题：本题共2小题，共计12分。

2014届高二物理第6周周末作业1．许多科学家在物理学发展过程中做出了重要贡献，下列叙述中符合物理学史实的是（）A.牛顿总结出了万有引力定律，并通过实验测出了万有引力恒量B.伽利略发现了单摆的等时性，并通过实验确定了单摆做简谐运动的周期公式C.库仑利用扭秤，通过反复实验，找到了电荷间相互作用的规律D.法拉第通过实验发现了电场线2．一列简谐横波沿介质传播，当波源质点突然停止振动时，介质中其他质点的振动及能量传递的情况是（）A．所有质点都立即停止振动B．已经振动的质点将继续振动，未振动的质点则不会振动C．能量将会继续向远处传递 D．能量传递随即停止3.一列简谐横波沿x轴传播，t=0时刻的波形如图所示。

则从图中可以看出（）A．这列波的波长为5mB．波中的每个质点的振动周期为4sC．若已知波沿x轴正向传播，则此时质点a向下振动D．若已知质点b此时向上振动，则波是沿x轴负向传播的4．若单摆的摆长不变，摆球的质量由20g增加为40g，摆球离开平衡位置的最大角度由4°减为2°，则单摆振动的（）A.频率不变，振幅不变B.频率不变，振幅改变C.频率改变，振幅不变D.频率改变，振幅改变5．关于单摆的运动有下列说法，正确的是（）①单摆的回复力是摆线的拉力与重力的合力②单摆的回复力是重力沿摆球运动轨迹切向的分力③单摆的周期与质量无关与振幅无关，与摆长和当地的重力加速度有关④单摆做简谐运动的条件是摆角很小如小于5°⑤在山脚下走时准确的摆钟移到高山上走时将变快A．①③④ B．②③④ C．③④⑤ D．①④⑤6．某质点在坐标原点O处做简谐运动，其振幅为5cm，振动周期为0.4 s，振动在介质中沿x轴正向传播，波速为1m/s。

若质点由平衡位置O开始向+y方向振动，经0.2 s时立即停止振动，则振源停止振动后经0.2 s时的波形是（）7．如图所示为沿x轴正方向传播的简谐横波在t=0时刻的波形，质点P位于x=lm处，质点Q位于x=7m处，已知x=1m处依次出现两次波峰的时间间隔是0.4s ，则以下叙述中正确的是( )A.这列波的波长是5mB.波源的振动频率是25 HzC.这列波的传播速度是10m/sD.质点P 和Q 的位移任何时候都相同 8．一列简谐横波沿x 轴传播，某时刻的波形如图所示，已知此时质点F 的运动方向向y 轴负方向，则 （ ）A ．此波向x 轴正方向传播B ．质点C 此时向y 轴负方向运动 C ．质点C 将比质点B 先回到平衡位置D ．质点E 的振幅为零 9.—列从O 点沿x 轴正向传播的简谐横波，在t1= 0.50s 时刻的波形图如图所示，已知t0= 0时刻坐标为x = 4m 的质点P 刚好第一次通过平衡位置沿y 轴正方向运动，则坐标为x=24 m 的质点Q 开始振动的时刻t2及开始振动时的运动方向分别是（ ）A. t2=0. 25s ，沿y 轴负方向B. t2=0. 75s ，沿y 轴负方向C. t2=1. 50s ，沿y 轴正方向D. t2=1. 25s ，沿y 轴正方向10.一列向右传播的横波在t =0时的波形如图所示，A 、B 两质点间距为8m ，B 、C 两质点在平衡位置的间距为3m ，当t =1s 时，质点C 恰好通过平衡位置，该波的波速可能为（ ）A.1/3 m/sB.3m/sC.13m/s D27m/s11．如图所示为一列横波在某时刻的波形图，若此时刻质点P 正处于加速运动过程中，则此时刻（ ）A ．质点Q 处于加速运动过程中，质点N 处于减速运动过程中B ．质点Q 处于减速运动过程中，质点N 处于加速运动过程中C ．质点Q 和质点N 均处于加速运动过程中D ．质点Q 和质点N 均处于减速运动过程中 12.一列机械波沿轴传播，在1=0和2=0.05时刻，其波形图分别用如图所示的实线和虚线表示，求：高二第6周周末作业答案。