题海网，海量题库；找题库、找试卷、找答案就上题海网。

如图，四边形 $\text{[math]}$ 是平行四边形，把△ABD沿对角线BD翻折180°得到△ $\text{[math]}$ .

（1）利用尺规作出△ $\text{[math]}$ .（要求保留作图痕迹，不写作法）；
（2）设 $\text{[math]}$ 与BC交于点E，求证：△ $\text{[math]}$ ≌△ $\text{[math]}$ .

Which sound goes with the word “public”?

A . /'pʌblik/ B . /'pæblis/ C . /'pəblik/ D . /'pəblis/

___________ of us is working hard to make our country richer and stronger.

A . Each B . Every C . Everyone D . Nobody

设 $\text{[math]}$ ，则“ $\text{[math]}$ ”是“ $\text{[math]}$ ”的（）

A . 充分不必要条件 B . 必要不充分条件 C . 充要条件 D . 既不充分也不必要条件

在某班级开展的“建设美丽乡村，共享美好生活”的讨论活动中出现了以下观点，其中正确的是（）

①乡村规划应坚持绿色发展，提高村民幸福指数

②以美丽乡村建设为工作中心，改善乡村环境

③加强不同地区的区域合作，有助于互利共赢

④既要扬长避短，因地制宜，又要加强区域联系

A . ①②③ B . ①②④ C . ①③④ D . ②③④

关于科学符号中数字“2”的含义，下列解释错误的是( )

A . S^2-：一个硫离子带2个单位负电荷 B . $\text{[math]}$ ：氧化镁中镁原子的化合价为+2价 C . 2Al：两个铝原子 D . N₂：一个氮气分子中含有两个氮原子

读图回答问题。

（1）酒泉、文昌、西昌、太原所在省份的简称分别是（）

A . 陇、琼、川、晋 B . 陕、琼、川、晋 C . 陇、海、川、晋 D . 陇、琼、滇、冀
（2）年平均降水量由多到少排列顺序正确的是（）

A . 酒泉、文昌、西昌、太原 B . 酒泉、太原、文昌、西昌 C . 文昌、西昌、太原、酒泉 D . 文昌、太原、西昌、酒泉

阅读理解

In northern Scotland there is a long, deep lake called Loch Ness. More than 200 meters deep, it is the largest lake in the UK．People say a big monster lives in its dark, cold waters. It weighs more than 1,000 kilos and is at least ten meters long. Some people say it has a head like a horse. Others say it looks 1ike a snake. Many people travel to Loch Ness to look for this strange monster, but only a few people have seen it. At least, they say they have seen it．

Loch Ness Monster is a famous legend. The first story about a monster in Loch Ness was told over 500 years ago, but the legend of the monster spread widely only in the twentieth century. In 1933, a husband and wife reported that they saw a big monster in the middle of the lake. Since then, a number of people have said that they have seen a monster in Loch Ness. Several people have taken photos, but at least one of them was a hoax. During the 1960s, a team was formed to look for the monster. They took many photos and made movies, but they were never able to find a monster.

There is no real fact that a monster lives in Loch Ness, but there is also no fact that one doesn't live．One thing is true about Loch Ness : there are a lot of tourists there．

（1） In northern there is a long，deep lake called Loch Ness.

A . Scotland B . Hong Kong C . Rome D . Paris
（2） What do people say about the monster in Loch Ness ?

A . It weighs about 100 kilos． B . It is one meter long C . It has a tail like a horse． D . It looks like a snake．
（3） Why was a team formed during the 1960s ?

A . To kill the monster． B . To look for the monster． C . To catch the monster． D . To sell the monster．
（4） What is the passage mainly about ?

A . People that saw a monster． B . A trip to Loch Ness． C . A legend about a monster． D . A team that took photos．

下图为某高等动物正在分裂的细胞模式图。下列叙述正确的是（）

图片_x0020_100005

A . 该细胞处于有丝分裂中期，染色体形态稳定，数目清晰 B . 由图可以看出，同源染色体之间发生了染色体互换 C . 该细胞若继续分裂可能会发生等位基因分离 D . 该细胞内有4条染色体，8条姐妹染色单体

运用相关材料，回答下列问题。

材料一：左图是北京市铁路网图，右图北京市气温曲线图和降水量柱状图

材料二：北京是全国高等院校最集中的地区，有众多的体育场馆，博物馆，中央电视台和中央人民广播电台，以及许多国家级的文艺团体等。

材料三：北京是一个重度缺水的城市，水资源人均占有量为300立方米左右，仅为全国人均占有量的七分之一，在世界各国首都中居百位之后，现在北京主要供水源地密云水库的来水量日益减少。

（1）材料一中，北京有多条铁路通往全国各地，形成了四通八达的铁路网，说明北京是我国重要的。根据北京的气候资料，说明北京属于气候。
（2）材料二说明北京是我国的中心。
（3）北京是我国著名古都和历史文化名城，有许多名胜古迹，下列名胜古迹全部属于北京的是（）（填字母代码）。

A . 古镇周庄、日月潭 B . 颐和园、南锣鼓巷 C . 南锣鼓巷、大三巴牌坊 D . 日月潭、明十三陵
（4）根据材料三提供的信息，说明北京城未来发展的限制性因素是。