钩身下平面原焊装金属磨耗板者，仍须焊装磨耗板；磨耗板须焊装在钩身下平面距钩肩50mm

Mark Twain was famous in his days as a public speaker. In his public speeches he always liked to tell funny stories. He also liked to listen to funny stories and play jokes on his friends.

One day one of his friends lost his wallet and asked Mark Twain to pay his train fare （车费）for him.

“But I don’t have enough money to pay both your fare and mine, ”Mark Twain said. The friend didn’t know what to do.

“We can do this, ”said Mark Twain. “We can get on the train and when the conductor(列车员) comes to check the tickets，you can hide(藏) under my seat. ”

Later, however, when the conductor came to check the tickets, Mark Twain gave him two tickets－one for his friend and one for himself . Then he explained in a loud voice. “My friend here is a strange man. When he travels on a train, he doesn’t like to sit on the seat. He prefers （宁愿）to lie on the floor under the seat. ”Of course everybody in the train looked at the poor friend and laughed at him loudly.

小题1:Mark Twain told him he couldn’t buy him a ticket because ______.

A．he didn’t have enough money

B．he wanted to play a joke(玩笑) on him

C．he wanted to save some money

D．he didn’t find his wallet, either小题2:When the conductor came to check the tickets, the friend was ________. 

A．lying under the seat

B．sitting on the seat

C．lying on the seat

D．standing nearby小题3:Mark Twain spoke in a loud voice because ______.

A．the conductor was standing far away

B．his friend was deaf （聋）

C．he enjoyed doing so

D．he wanted all the people here to know there was a man under the seat

鸟类扇动翅膀的动力主要来自 (   )

A．背部肌肉

B．两翼肌肉

C．腹肌

D．胸肌

下列实验操作中正确的是(　　)

中华人民共和国民政部　2012年6月21日　发布公告：国务院于近日批准，撤销海南省西沙群岛、南沙群岛、中沙群岛办事处，设立地级三沙市，管辖西沙群岛、中沙群岛、南沙群岛的岛礁及其海域。三沙市人民政府驻西沙永兴岛。　　

专家认为，以前中国只在永兴岛上设立派出机构，行政级别相当于街道办事处，而这次直接以地级市的行政级别来行使管辖权，这是根本性的变化，表明了中国政府维护南海诸岛主权和国家利益的决心。　　

（1）分析中国政府维护国家主权和国家利益的原因。（6分）　　

（2）运用《政治生活》知识，谈谈中国政府如何维护国家主权和国家利益？（10分）　　

磁吸式危险货物标志灯适用于载质量2吨（含）以下，用于城市配送车辆。