出入波斯湾必须经过的被称为“世界油阀”的海峡是（    ）

阅读短文，判断正误。
    Hello, friends! Let's go on a trip to Beijing. Beijing is the capital city of our country. It's in the north of China. There is a big square in this city. Do you know its name? Its name is Tian'anmen Square. In Beijing, you can see the Bird's Nest(鸟巢). The 2008 Olympic Games were held in it. And you can see some old buildings, such as the Palace Museum. The Great Wall is also very famous in China. It's very old and long.

如图，某同学把一块三角形的玻璃打破成了三块，现在他要到玻璃店去配一块完全一样形状的玻璃，那么最省事的办法是带去（    ）

图片能反应一个时期的政治和军事。下列图片反映了一个主题，最恰当的是（ ）

有机化学主要研究有机化合物所发生的反应，下列化合物中不是有机物的是（   ）