内燃机的发明，其意义远远超过瓦特对蒸汽机的发明，它造就了20世纪的石油世纪，打开了石油的“潘多拉盒子”。“打开了石油的‘潘多拉盒子’”的含义是指(　　)

①能源及新兴工业发展 ②动力革命推动交通工具的革命 ③对能源产地争夺更激烈，严重污染环境 ④促成世界市场的基本形成

A．①②③      B．①②④         C．①③④     D．②③④

人的眼色是由两对等位基因（AaBb）（二者独立遗传）共同决定的．在同一个体中，两对基因处于不同状态时，人的眼色如表所示．

个体内基因组成                                性状表现（眼色）

四显基因（AABB）                           黑色

三显一隐（AABb、AaBB）                褐色

二显二隐（AaBb、AAbb、aaBB）      黄色

一显三隐（Aabb、aaBb）                  深蓝色

四隐基因（aabb）                             浅蓝色

若有一对黄眼夫妇，其基因型均为AaBb．从理论上计算：

（1）他们所生的子女中，基因型有      种，表现型共有   种．

（2）他们所生的子女中，与亲代表现型不同的个体所占的比例为      ．

（3）他们所生的子女中，能稳定遗传的个体的表现型及比例为             ．

（4）若子女中的黄眼女性与另一家庭的浅蓝色眼男性婚配，该夫妇生下浅蓝色眼女儿的概率为             ．

已知,,则用表示为(   )

A.         B.           C.         D.

我国己有28省份开通高铁，50万人口以上城市基本覆盖，中国进入了高铁时代，越来越多的人将选择高铁作为出行工具。同为交通工具，高铁与飞机是

A.互补商品

B.价值最相同的商品

C.替代商品

D.价格档次相同商品

关于100ml 1mol/LCaCl₂溶液的叙述正确的是（　　）

A. Cl^-的物质的量浓度为2mol/L                                 B. CaCl₂的物质的量为1mol

C.取出50 mL后，剩余溶液中CaCl₂的物质的量浓度为0.5mol/L      D_.该溶液中水的体积为100 mL

如图所示，电灯的重力G=10N，AO绳与顶板间的夹角为45°，BO绳水平，则AO绳所受的拉力F1是多少？BO绳所受的拉力F2是多少？

万有引力的发现实现了物理学史上的第一次大统一——“地上物理学”和“天上物理学”的统一．它表明天体运动和地面上物体的运动遵循相同的规律．牛顿在发现万有引力定律的过程中，将行星的椭圆轨道简化为圆轨道，还应用了其他的规律和结论．下面的规律和结论被使用到的有

A．开普勒行星运动定律              B．卡文迪许通过扭秤实验测出的引力常量

C．牛顿第二定律                    D．牛顿第三定律

________ he was very young, he knew a lot because his father was a college professor and had taught him a lot.

A. When        B. Since       C. Because       D. While

10．补写出下列句子中的空缺部分。

（1）《诗经·氓》中暗示女主人公对男子的忍耐也是有极限的两句是“                ，                 ”。（《 诗经·氓》）

（2）《离骚》中表明屈原即使受挫也不会改变自己志向的两句是“                    ，                     ”。（《离骚》）

（3）《赤壁赋》中侧面描写箫声很感人的两句是“                             ，

                             ”。（《赤壁赋》）

为了追求利润，一些企业在食品中大量使用添加剂严重威胁人们的健康，有的企业漠视员工生命造成重大安全事故和环境污染，很多企业对社会慈善公益事业漠不关心。针对上述现象，你认为企业应当承担的社会责任有：

①提高经济效益，实现赢利的目的　②树立良好的信誉和企业形象　③积极参与社会公益事业  ④遵守法律法规和社会公德

A．①②       B．②③      C．③④   D．②④

属于氮的固定的是

A. 植物从土壤中吸收含氮养料

B. 豆科植物把含氮化合物转变为蛋白质

C. 将氨转化为硝酸，再转化为其他含氮化合物

D. 将空气中的氮气转化为含氮化合物

下列各组物质反应产生的气体分别通入Na₂SO₃溶液中，与Na₂SO₃不发生反应的是（   ）①Na₂O₂和CO₂           ②Al和NaOH溶液          ③MnO₂和浓盐酸共热

④浓硝酸和铜片       ⑤铜片和浓硫酸共热

A.只有②         B.只有①②        C.只有①②⑤      D.只有②④⑤

当我国各地白昼时间最短时，图2—4所示气压带、风带分布正确的是

A.a      B.b      C.c       D.d

将某植物幼苗分别培养在不同浓度生长素溶液中，再用相同的水平单侧光照射根部，测得根的生长情况及负向光性倾斜角度（α）如图所示．下列叙述错误的是（　　）

与有丝分裂相比，减数分裂过程中染色体变化的显著特点是（　　）

　 A． 间期进行染色体复制

　 B． 中期染色体排列在赤道板上

　 C． 同源染色体联会形成四分体

　 D． 着丝点分裂，一个染色体变成两个染色体

已知a、b、c是△ABC的三条边，它们所对的角分别是A、B、C，若a、b、c成等比数列，且a²－c²＝ac－bc，试求

⑴角A的度数；

⑵求证：；

（3）求的值.

 (1)如图甲所示是“探究做功与物体速度变化的关系”的实验装置示意图，关于该实验，下列叙述正确的是　▲  　

A．放小车的长木板应尽量水平

B．先接通电源，再让小车在橡皮筋的作用下弹出

C．每次改变橡皮筋的根数，不必将小车拉到相同的位置释放

D．每次实验必须设法算出橡皮筋对小车做功的具体数值

 (2) 若根据多次测量数据画出的W－v图象如图乙所示，根据图线形状可知，关于橡皮筋做功W与小车速度v的关系作出以下的猜想，其中肯定不正确的是　▲ 

A．W∝      B．W∝      C．W∝v²    D．W∝v³

下列关于氧化还原反应的原理分析，正确的是

A．氧化剂氧化其他物质时,本身被还原

B．含有最高价元素的化合物一定具有强氧化性

　 C．失电子越多,该物质的还原性就越强　

 D．某元素由化合态变成游离态一定被还原

把少量废铁屑溶于过量的稀硫酸，过滤，除去杂质，在滤液中加入适量硝酸，再加入过量的氨水，有红褐色沉淀生成。过滤，加热沉淀物至质量不再发生变化，得到红棕色的残渣。上述沉淀和残渣分别为（ ）

A．Fe₂O₃；Fe(OH)₃                                       B．Fe(OH)₃；Fe₂O₃

C．Fe(OH)₂；FeO                                          D．Fe(OH)₃；Fe₃O₄

Mr. Harris used to work in Dover, but then he changed his work, and he and his wife moved to another town. They did not have many friends there, but they soon met a lot of interesting people, and after a few weeks, they often went to dinner or to parties at other people’s houses.

Then Mrs. Harris said to her husband, “We’ve been to a lot of other people’s houses, and now we must invite them to our house, mustn’t we?” “Yes, certainly,” answered her husband, “A big party will be the easiest thing, won’t it? Then we can start to invite people to dinner in small numbers next month.”

So Mrs. Harris said, “Yes, I’ll invite all our friends here to a big party on 5th December.”

“How many will that be?” Mr. Harris asked. “Don’t invite too many.”

Mrs. Harris was beginning to write the invitations when her husband saw that she was writing, “Party. 6.30 to 8.30 p.m.”

“That isn’t very nice, is it?” he said. “You’re telling our guests that they must go at 8.30. Maybe it is impolite.” So Mrs. Harris just wrote “Party. 6.30 p.m.”

A lot of guests came, and they all had a good time, so they did not go home at 8.30. In fact they were still there at mid-night when the door bell rang and a policeman arrived. He said, “You must stop making a noise, because someone has complained（抱怨）.”

Mr. Harris said he did not want to quarrel with the policeman, so everyone went home. They were sorry to have to go.

When Mr. and Mrs. Harris were alone again, she said to him. “That was a surprise, wasn’t it? Who complained about the noise?”

“I did,” Mr. Harris answered in a tired voice.

21.Why did Mr. Harris and his wife move to another town?

A. They wanted to make some new friends.

B. Mr. Harris changed his work.

C. They wanted to meet a lot of interesting people.

D. They enjoyed going to parties and visiting other people’s houses.

22.What made Mr. and Mrs. Harris hold a party at their house?

A. It was easy to hold a big party at home.

B. They could ask people to dinner in small numbers.

C. They had gone to other people’s parties many times.

D. They liked making friends with others.

23. When did the party end that evening?

A. At about 8.30.

B. When the policeman talked with Mr. Harris on the phone.

C. About twelve o’clock..

D. When someone telephoned the police station.

24. Why did Mr. Harris telephone the policeman about the noise?

A. Because someone rang his door bell many times at mid-night.

B. He did not want his friends to stay late that night.

C. His friends had a good time that night and also feel tired.

D. Because his neighbours hated the noise.