下面几种煤密度依次升高的是（）。 A.褐煤烟煤无烟煤 B.无烟煤烟煤褐煤 C.褐煤无

阅读理解。

     Why does the Leading Tower of Piza (比萨斜塔) in Italy lean (倾斜)? It leans because of a mistake.

It has leaned almost since the day the tower was built.

     In 1174, the people of Piza, Italy wanted to build a bell tower. They wanted the tower to be the most

beautiful bell tower in all of Italy. The city also needed a bell tower because the church did not have one.

     As soon as the first floor of the building was finished, the tower started to lean. Builders tried to make

the building straight again as they added more floors, but the Leaning Tower only got worse as the tower

grew.

     It took almost 180 years to finish the tower. It is 54.5 metres tall, and it leans almost 4 metres to one

side. The tower is also sinking into the ground on which it was built. Every year, the tower leans another

1.5 centimetres.

     Like all old buildings, it is also falling apart. If someone cannot figure out (想出) a way to save the

tower, the Leaning Tower of Piza will fall down after 175 more years.

1. The Leaning Tower of Piza is in _____. [ ]

A. America

B. Canada

C. England

D. Italy

2. People built the Leaning Tower of Piza in _____.

A. 1175

B. 1165

C. 1174

D. 1800

3. The Leaning Tower of Piza is _____ metres tall, and it leans almost _____ metres to one side. [ ]

A. 180; 54.5

B. 175; 4

C. 54.5; 4

D. 180; 4

4. People finished the Leaning Tower of Piza nearly in _____. [ ]

A. 1174

B. 1245

C. 1340

D. 1354

5. Which of the following is not true? [ ]

A. The Leaning Tower of Piza leans less than 0.5 centimetres every year.

B. The Leaning Tower of Piza is a bell tower.

C. It took almost 180 years to finish the Leaning Tower of Piza.

D. The Leaning Tower of Piza maybe falls down after 175 more years.

许婷用如图1所示的电路测量小灯泡的电功率的同时，测量小灯泡的电阻．小灯泡额定电压为2.5V，正常工作时电阻约8Ω．

实验室提供的器材有：电压为6V的电源，电压表V（量程为6V）．滑动变阻器R₁（规格为“10Ω，1A”），滑动变阻器R₂（规格为“50Ω，0.5A”），电流表A₁（量程0.6A），电流表A₂（量程3A）．

（1）为保证实验顺利进行，并且有较高的准确性，滑动变阻器应该选　  　，电流表应该选　  　．

（2）许婷在实验时，将电流表和电压表的位置交换了，其他连接正确，闭合开关后　  　．

A．电流表烧坏    B．电压表示数约6V    C．小灯泡烧坏     D．小灯泡不亮

（3）正确连接好电路后，闭合开关，从大到小调节滑动变阻器的阻值，并将电压表和电流表部分读数填在下表中．电压表读数为2.5V时，电流表的示数如图2所示，请帮许婷将此读数填在下表中．

序号	电压表示数U/V	电流表示数I/A
1	1.0	0.14
2	1.5	0.21
3	2.0	0.26
4	2.5
5	3.0	0.36

（4）根据补充完整后的上表数据，测得小灯泡在电压为2.0V时的实际功率是　  　W，在正常工作状态时电阻是　  　Ω．

辛亥革命的结果怎么样？它的伟大功绩有哪些？

________________________________________________________________________________

再一次春游活动中，小刚同学的手指被蜜蜂蛰了一下后，手不由自主的立即缩回，之后感到疼痛。过了一会儿，有同学喊：“这里也有一只小蜜蜂！”小刚马上把手插到衣袋中，并躲到一边。

（1）小刚的手指被蜜蜂蛰后立即缩回属于_______反射。

（2）小刚听到“这里也有一只蜜蜂”的喊声后，把手插到衣袋中，并躲到一边，这属于_______反射。

（3）手指被蜜蜂蛰后立即缩回，说明脊髓具有_______功能，然后产生了痛觉，说明脊髓还有_______功能。

于中性或酸性溶液中可将肾上腺素氧化为肾上腺素红，显血红色的试剂

A．二乙氨基乙醇
B．碱性亚硝基铁氰化钠试液
C．二氧化锰
D．过氧化氢试液
E．硫酸铜试液