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下列各句中，没有语病的一句是（）
When did you last see a polar bear?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.These"Polar Bears"are peopl
X、Y、Z三种元素的原子具有相同的电子层数，它们的最高价含氧酸的酸性强弱顺序是H3XO4＜H2YO4＜HZO4．则下列说法正确的是（　　）A.原子序数X＞Y＞Z B.原子半径X＜Y＜Z C.气态氢化物的稳定性H3X＞H2Y＞HZ D.元素的非金属性X＜Y＜Z
“…nor does giving people breakfast improve performance”means______.
如图1—16所示，在水平力F的作用下，质量为ml的木块A和质量为m2的木块B静止靠在竖直的墙面上，两木块接触面与墙面平行，设μ为A与B接触面的动摩擦因数。求A受到B的摩擦力的大小和方向。
Brighton is a popular seaside town on the south coast of England.Not long ago,some policemen were very?21.There had been several,serious accidents?22?by motorists driving too fast.The police started
I have been hearing-impaired in my life since I was five years old.Putting on hearing aids in the?morning has been just as（21）as brushing my teeth.However I never believed that it should limit?my（22）
材料题通读正面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选择。 A Shelter for the Homeless Last summer I was a volunteer(志愿者)at a shelter for the homeless,a place for homeless people to sleep at night．I wasn’t working that summer and was 21 only two classes in summer sc
I asked my teacher_______.A.what courses should I take B.should I take what courses C.I should take what courses D.what courses I should take
下列氮肥中含氮量最高的是
“大陆会议”通过《独立宣言》的时间是（）
Eleanor Roosevelt was the wife of America′s 32nd president,Franklin Roosevelt.She helped her husband in?many ways during his long（21）life.She also became one of the most（22）women in America.She fough
确立行政、立法、司法三权分立的政治原则，具有资产阶级共和国宪法性质的历史文献是（　　）
如图11—23所示，在磁感应强度B＝0.4T、方向垂直纸面（水平面）向里的匀强磁场中，有两根平行的金属导轨，导轨上面放置两根平行的直的金属线AB和CD，它们可以在导轨上运动，今使AB
如图所示，在竖直平面内有一光滑的圆形轨道，轨道的半径为R，一小球可在轨道内侧做圆周运动，且在通过圆周顶端的A点时不脱离轨道掉下来。则：（1）小球通过A点的最小速度v0为多大? （2）在小球以速度v0通过A点的情况下，小球运动到B点时对轨道的压力F为多大?
命题甲：实数a，b，c成等比数列；命题乙：b2＝ac，则甲是乙（　　）
下列各句中，没有语病的一句是（）
简析“同是天涯沦落人，相逢何必曾相识”的内在含意。
（）It is very kind______see me.
在实验室中欲制取H2、Cl2、CH4、O2、CO2、C2H4气体，其中可用图8-10所示装置收集的气体是　　　.