3.如图甲所示,一个质量为
、电荷量为
的带电粒子,不计重力。在
点以某一初速度水平向左射入磁场区域Ⅰ,沿曲线
运动,
、
、
都是半径为
的圆弧。粒子在每段圆弧上运动的时间都为
。规定由纸面垂直向外的磁感应强度为正,则磁场区域ⅠⅡⅢ三部分的磁感应强度
随
变化的关系可能是乙图中的( )
![]()
2.一艘小船沿一定航向渡河,由于水流的作用,此时小船恰能沿垂直河岸方向抵达对岸。今保持小船的航向和动力的大小不变,则( )
A.若水流速度减小,则小船抵达对岸时将偏向下游B.若水流速度减小,则小船的合速度增大
C.若水流速度增大,则小船抵达对岸时间减少 D.若水流速度增大,则小船的合速度不变
1.汽车沿平直的公路向左匀速行驶,如图所示,经过一棵树附近时,恰有一颗果子从上面自由落下,则车中的人以车为参照物,看到果子的运动轨迹是下图中的( )
![]()
第二节:写作(满分30分)
在网络游戏的冲击下,曾经陪伴过几代人的传统游戏(如捉迷藏)日渐消失。学校、家庭乃至社会应该创造条件让这些传统游戏回归,让孩子们在这些游戏中体验童年的天真和快乐。请你据此写-篇120-150词的英语短文,发表你的看法。
第二节 完形填空(共20小题;每小题1分,共20分)
阅渎下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。
Lucky to have him
When 1 met him, I had a lot of anger inside of me.I never had a father, though in my neighborhood that's not 36 .I know some kids just like me.You have to 37 yourself.There are fights and killings all the time.I have friends who ended up in jail or pregnant.1 could have ended up that way, too, 38 Mr.dark and my mom wouldn't let that happen.
Mr.dark worked long hours, making sure I did my work.My grades rose.In fact, I did so well that in sixth grade, I entered the 39 class, and Mr.dark was the teacher.I felt so 40 to have him for a second year!
He took our class to see The Phantom of the Opera.Before the show, he 41, us to dinner at a restaurant and taught us not to talk with our mouths full.We didn't want to let him 42 .so we listened to him attentively.
43__ of us were surprised when Mr.dark was selected as Disney's 2000 Teacher of the Year.When he learned he'd won, he said he would 44 three names out of a hat; he would go to Los Angeles to get the 45 with those students.But 46 it came time to draw names, Mr.dark said, "You're all going."
He got 47 to fly all 37 of us out to Disneyland in California and put us up at the Hilton.People were 48 , but Mr.dark really cared about us.There's no way I can 49 most teachers doing that.No way.But he saw something in us that nobody else saw.
On graduation day, there were a lot of tears.We didn't want his class to 50 .In my new school year, we were all happy when Mr.Clark 51 in my class.He's been a 52 in our lives.
In 2003, Mr.dark took some of us on a trip to South Africa to 53 school supplies and visit orphanages.It was the most amazing 54 of my life.It's now my 55_ to one day start a group of women's clubs, helping people from all background.
36.A.common B.normal C.real D.unusual
37.A.encourage B.watch C.comfort D.tolerate
38.A.but B.therefore C.otherwise D.or
39.A.local B.general C.gifted D.sacred
40.A.sudden B.lucky C.annoyed D.anxious
41.A.treated B.dire
cted C.showed D.swapped
42.A.off B.out C.up D.down
43.A.Some B.Any C.None D.Many
44.A.give B.draw C.enter D.register
45.A.reward B.bonus C.diploma D.award
46.A.after B.when C.before D.since
47.A.donations B.suggestions C.requests D.messages
48.A.excited B.satisfied C.ashamed D.amazed
49.A.suggest B.advocate C.imagine D.complain
50.A.end B.start C.continue D.last
51.A.picked up B.showed up C.rang up D.packed up
52.A.colleague B.sponsor C.success D.constant
53.A.deliver B.collect C.display D.recommend
54.A.adventure B.experience C.vacation D.interview
55.A.turn B.conclusion C.dream D.demand
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