我国政府大力推行“退耕还林”政策的根本目的是（ ） A．发展旅游业 B．发展畜牧

Jack is an Englishman. He likes travelling around the world. He has visited many countries. He knows few foreign languages, but he can always find someone who knows enough English to understand what he says. Last summer he went to China. He enjoyed himself in China and liked Chinese food very much.

One day he went into a restaurant in a small village. He knew the Chinese word ‘rice’, so he ordered some rice. The village was famous for its mushrooms, and Jack thought they must be very fresh and delicious. He asked the waiter in English, but he could do nothing for Jack. Jack thought hard. When he saw a piece of paper on the table, he had a good idea. He took out a pencil and drew a picture of a mushroom carefully. The waiter looked at the picture for a long time, then he smiled and left. A few minutes later, he came back with a black umbrella in his hand.

小题1:What does ‘mushrooms’ mean?

A．洋葱

B．花菜

C．洋伞

D．蘑菇小题2:The waiter didn’t help Jack because _____________.

A．he had no mushrooms in the kitchen

B．he thought the mushrooms were poisonous

C．he didn’t know English well

D．he disliked the mushrooms小题3:Jack asked the waiter for ___________.

A．a pencil

B．a picture

C．an umbrella

D．some mushrooms小题4:The waiter smiled because __________.

A．the picture was beautiful

B．he was very happy

C．Jack gave a gift to him

D．he thought he understood Jack小题5:At last the waiter came back with an umbrella, because _______.   

A．it is raining outside

B．it is going to rain

C．the mushroom Jack drew looked like an umbrella

D．Jack was good at drawing

2012年4月15日，央视《每周质量报告》对“非法厂商用皮革下脚料造药用胶囊”曝光，其制成的胶囊往往重金属铬超标．

（1）如图是铬元素在周期表中的一格，你能从该图得到的信息有：①______；②______（写两条）．

（2）铬的化合物可用于检测司机是否酒后驾车，其原理为遇到酒精，红色的CrO₃转变为绿色的Cr₂（SO₄）₃，在CrO₃中铬元素的化合价为______价．

横梁上如需垫短枕承托时，则短枕只是与护轨联结牢固，且与基本轨底的允许最近距离为（）。

A、5mm

B、10mm

C、15mm

D、30mm

人类日常生活离不开摩擦力，如果没有摩擦力，我们将不能走路、汽车不能运动……下列关于摩擦力的说法中正确的是[ ]

A．吃饭时拿在手中的筷子不会滑落，是因为有摩擦力的作用

B．汽车轮胎表面都有花纹，是为了减小摩擦

C．猴子沿竖直竹竿匀速上爬，是因为摩擦力大于猴子重力

D．在结冰的水平路面上洒些细土，人走上去不易滑倒，是因为此时人与路面间的最大静摩擦力增大了

颁布了世界上第一部具有现代意义的专利法的国家是（）

A、英国

B、俄国

C、西班牙

D、德国