2.(2009·全国Ⅰ,19)天文学家新发现了太阳系外的一颗行星.这颗行星的体积是地球的4.7倍,质量是地球的25倍.已知某一近地卫星绕地球运动的周期约为1.4小时,引力常量G=6.67×10-11 N·m2/kg2,由此估算该行星的平均密度约为( )
A.1.8×103 kg/m3 B.5.6×103 kg/m3 C.1.1×104 kg/m3 D.2.9×104 kg/m3
解析:近地卫星绕地球做圆周运动时,所受万有引力充当其做圆周运动的向心力,即:G=m2R,由密度、质量和体积关系M=ρ·πR3解两式得:ρ=≈5.60×103 kg/m3.由已知条件可知该行星密度是地球密度的25/4.7倍,即ρ=5.60×103× kg/m3=2.9×104 kg/m3.
答案:D
1.
图4-4-4
三颗人造地球卫星A、B、C在同一平面内沿不同的轨道绕地球做匀速圆周运动,且绕行方向相同,已知RA<RB<RC.若在某一时刻,它们正好运行到同一条直线上,如图4-4-4所示.那么再经过卫星A的四分之一周期时,卫星A、B、C的位置可能是( )
答案:C
(三)书面表达(满分30分) 请你根据所给材料、提纲以及要求写一篇英文稿件。
背景材料:
English Horizons 第25卷 总228(5/2007)期
编者按:本期刊出Lora的来信,欢迎读者就信中谈到的问题逆
互动空间 行分析并提出建议。 Dear editor. I’m a senior high school student, and I want to work part-time this summer. I think it is good to do so, but my parents don’t agree with me I just can’t understand them I need your advice. Lara |
要求:
1.短文须写在答题卡的指定区域。
2.短文词数不少于80(不含已写好的部分)。
3.内容充实,结构完整,语意连贯。
4.书写须清晰、工整。
提纲:
第1段:Lora利用暑假打工的理由
第2段:Lora父母不同意的理由
第3段:你给Lora的具体建议
I think that Lora wants to work part-time for these reasons. First,she can make some pocket money to meet pet daily needs and thus develop a sense of independenca. Second. she can learn how to deal with various problems in the workplace. Third,she can build up new friendships and improve bet social skills.
But her parents may regard learning as an increasingly important task for Lora. This holiday should be a catch-up time for independent study. Besides,personal safety may also be one of their maior considerations.
My advice for Lora is this:make a detailed plan for her study and work;ask her friends to work together with her, and tell her parents that she ean manage things properly. I wish Lora a pleasant summer.
B卷选择题答案 1.B 2.D 3.C 4.B 5.A 6.D 7.C
8.D 9.C 10.A 11.C 12.A 13.D 14.B 15.A 16.C
17.A 18.B 19.D 20.B 21.C 22.A 23.B 24.A 25.D
26.B 27.C 28.A 29.B 30.D 31.B 32.D 33.D 34.A
35.C 36.D 37.C 38.A 39.B 40.C 41.A 42.B 43.B
44.D 45.D 46.C 47.B 48.A 49.A 50.C 51.C 52.D
53.D 54.C 55.B 56.D 57.A 58.C 59.B 60.A 61.C
62.B 63.A 64.E 65.F
根据下列各句句意和空白之后的汉语提示词,在答题卡指定区域的横线上写出对应单词的正确形式,每空只写一词。
66.Spring has come, and the trees are thick with green leaves (叶子).
67.Andorra is a small mountain republic (共和国)between France and Spain.
68.I consider it impossible (不可能) to believe a single word you say.
69.He turned on the television sct hanging from the ceiling (天花板).
70.We were talking on the phone when, suddenly (突然), the line went dead.
71.One of my favourite sayings is “Understand all and fargive (宽怒)all.”
72.A man I recognized/trcognized (认出)as his father sat with a newspaper on his knees.
73.Techaical progress would put out firm in posseasion (拥有) of the home market.
74. Winning (赢得) the support of the majority requires time,energy and devotion.
75.Xi’an International Exhibition (展览) Center has attracted many business people.
(二)短文改错(共10小题,每小题1.5分,满分15分)
据题要求在答题卡上改正所给短文中的错误。请根据上下文对标有题号的每一行作出判断;如无错误,在该行右边横线上划一个勾(√);如有错误(每行只有一个错误),刚按下列情况改正;
此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出应加的单词。
此行错一个词:在错词下划一道线,在该行右边横线上写出改正后的单词。
注意:原行没有错误的不要改。
Are the years you spent at school best years of you life? 76. the
Personally, I found most lesson rather uninteresting. We had to 77. lessons
sit at our desks in silence and paid attention to what the teachers 78. pay
were saying. They were used to write on the blackboard and ask 79. were
us difficult questions. We also had to do plenty of homework,and 80. √
hand it on time. We had to wear school uniforms and obey lots of 81. in
rules. I left school as soon as I can and started work. I read books 82. could
at the publie library, and late I decided to attend college. Now 83. later
I really enjoy study because I’m growing old and know what I 84. studying
Want it. When I was at school. I was just the wrong age! 85. it
40.A.How B.Who C.Why D.What (D)
39.A.curiously B.carefully C.naturally D.plainly (A)
38.A.In B.Upon C.After D.With (C)
37.A.should B.could C.might D.would (B)
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