小莹和小博士下棋，小莹执圆子，小博士执方子．如图，棋盘中心方子的位置用（﹣1，0）表示，右下角方子的位置用（0，﹣1）表示．小莹将第4枚圆子放入棋盘后，所有棋子构成一个轴对称图形．他放的位置是（   ）

解读图表是学习历史的重要方法。出现下表数据变化的主要原因是（    ）

1952年和1956年各种所有制经济在国民收入中所占比例

年份	个体经济	私营经济	公私合营经济	集体所有制经济	国营经济
1952	71.8%	6.9%	0.7%	1.5%	19.1%
1956	7%	0.1%	7.3%	53.4%	32.2%

下列对于《苏菲的世界》的表述，错误的一项是（    ）

下图生物“进化树”形象而简明地表示出生物进化的主要历程，下列叙述正确的是（      ）

北京拥有3000年的建城史和800多年的建都史，悠久的历史为北京留下了无数的名胜古迹，这体现了北京职能的（   ）

医院的B超检查病情是利用声可以传递；小提琴演奏者通过变换手指按压琴弦的位置来改变琴弦发声的。

下列叙述中，正确的是（    ）

 对健康的定义理解正确的是(     )

对长征的错误评价是（    ）

近代以来，中国的对外开放经历了从被迫开放到主动开放的过程。阅读材料，结合所学知识，回答问题。

材料一：                                                                         

材料二：当今世界，无论什么国家要发展壮大，都必须把自己融入世界发展的大潮中。1978年到2013年，中国对世界经济的贡献率从2.3%上升到近30%。2015年3月，中国政府发布了《推动共建丝绸之路经济带和21世纪海上丝绸之路的愿景与行动》，“一带一路”建设启动。通过“一带一路”，中国将以更加积极的姿态走向世界。

等腰三角形一腰上的高与另一腰所成的夹角为45°，则这个等腰三角形的顶角的度数为.

天气渐暖，如图是本地常见的蚊、蝇品种。有关叙述错误的是（   ）

彭德怀是中国杰出的无产阶级革命家和军事家。他的贡献不包括（    ）

阅读理解

During the summer holiday, some students might have been busy with travelling, summer camps and all kinds of courses, but a specia1 group of Chinese middle school students decided to taste the hardship of life outside school.

Twelve students in a big city sold vegetables at a local market together. Within 12 days, they made more than 1, 500 yuan. Among them, the oldest is 21 years old, while the youngest is just 10. They are all cousins in a big family and eight of them are from rura1(农村的) areas.

"Compared to travelling, such social practice connects us and makes us learn how tough our parents are," said Dalin, 18, to the City Morning Post. Dalin, a senior high graduate, and her 12-year-old brother Xiaolin came up with the idea.

They learned to work hard to sell their vegetables. Every morning they had to wake up at 3 o'c1ock. Some of them went to the farmer's market to buy vegetables. Some of them went to the local market to take up a temporary stall (临时摊位). To 1ower the cost, they learned to bargain (讲价) with the sellers.

At about 6:30 am, they began to sell vegetables. They peddled (吆喝) 1oudly to attract (吸引) customers. After severa1 days, they got some experience too. For example, it was better to put vegetables in order and bigger ones on top. When the vegetables are too heavy, they should give customers an extra plastic bag.

When they finally packed up and went home, they had a small meeting. Everyone took notes and shared their feelings. "We are tired," said Dalin. "But we gained a lot."

中英《南京条约》中开放的通商口岸是（    ）

阅读材料，从A、B、C、D四个选项中选出最佳答案。

    There was once a musician. He said he was not afraid of dangerous animals, "Even a bear would be as quiet as the friendliest cat when hearing my music." But he had never played the game, and no one believed him.

    A chance to show his words arrived just when a circus (马戏团) came to the town. The musician came to the ringmaster (领班) and told what he could do.

    "Wow, that's interesting." The ringmaster said. "We just have three new lions and they haven't worked with the lion tamer (驯兽师) yet. Let's see what you can do with them." The musician agreed and the whole town crowded the hall to see what would happen.

    The musician was standing quietly in the center with a smile. Then the ringmaster opened the door of the cage and jumped out angrily a huge lion, shouting and showing his teeth. Everyone was too nervous to breathe.

    Still with the smile, the musician began to play. The beautiful music rose, then the lion sat down and began to enjoy the music. Everyone lost themselves in the music. The lion did, too. For the second lion, ________________.

    Then it was the third lion's turn to appear and everyone there was waiting for the lion to be quiet just like the other two. But the lion ran up to the man and ate him.

    All the people were surprised. The other two lions asked angrily, "What have you done! We were enjoying the music!" The third lion put his paw (爪子) to its ear and said, "Sorry, I can't hear you. I have been deaf for 5 years."

水稻的体细胞中有12对染色体，请完成下列填空．

（1）水稻在形成精子和卵细胞的细胞分裂过程中，染色体都要 ．

（2）水稻抗倒伏是由基因DD控制的，在它产生的精子中，存在有抗倒伏基因 ．

（3）在水稻的受精卵中，含有 对染色体．

如图，在▱ABCD中，DE平分∠ADC，AD=8，BE=3，则▱ABCD的周长是（　　）

甲、乙两车沿平直的公路通过同样的路程，甲车在前半段和后半段路程上分别以40km/h和60km/h的速度运动；乙车在前半段和后半段时间内分别以40km/h和60km/h的速度运动，则甲、乙两车在整个路程的平均速度之间的关系是（   ）

如图1，四边形 是矩形，点 的坐标为 ，点 的坐标为 .点 从点 出发，沿 以每秒1个单位长度的速度向点 运动，同时点 从点 出发，沿 以每秒2个单位长度的速度向点 运动，当点 与点 重合时运动停止.设运动时间为 秒.