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     Tibet is among the most popular places for Chinese tourists. The number of travelers to Tibet has

grown by 10% every year for a few years. Since July 1,2006, when the first train ran 1956 kilometers

from Xining to Lhasa, more and more people have been going to Tibet.

     The train stops at several famous places along the way, such as Qinghai Lake, Kunlun Mountain, and

the Potala Palace. Passengers can also enjoy many activities during the journey, like Tibetan dancing and

Karaoke.

     On the train, passengers can have tea, eggs and noodles for breakfast, and fried chicken and green

vegetables for lunch and dinner. Unlike most Chinese trains which have open - hole toilets, this one has

special toilets which can collect the waste. There is also a special rubbish system(系统) in the train that

keeps the environment clean. All the windows on the train can protect people from the bright sunlight.

TV and electrical sockets(插座) for computers and mobile phones can be found on the train.

     Because there isn't much oxygen there, trains will have oxygen masks(氧气罩) for those who need

them. It makes passengers feel more comfortable when they have enough oxygen on the famous "roof

of the world". There are also doctors on the train to make sure that all of the travelers are safe.

1. Which of the following is NOT among the places of interest?

A. Qinghai Lake

B. Karaoke

C. Kunlun Mountain

D. The Potala Palace

2. The train is unlike most Chinese trains except its __________.

A. windows

B. toilets

C. sockets

D. rubbish

3. The underlined word “them” in the last paragraph refers to__________.

A. oxygen masks

B. doctors

C. oxygen

D. passengers

4. We can learn from the passage that __________.

A. flying to Tibet is impossible

B. train to Lhasa is too clean to take

C. train trip to Tibet is popular with travelers

D. taking train to Lhasa causes a lot of trouble

5. What’s the best title of the passage?

A. Tibet - Roof of the World

B. Magic Train to Magic Tibet

C. Beautiful Views in Tibet

D. A Comfortable Trip to Tibet

胰腺直接分泌具有生物活性的酶是

A．胰蛋白酶原
B．淀粉酶
C．激肽酶
D．弹力蛋白酶
E．磷脂酶A

如图（a）所示，一个电阻值为R，匝数为n的圆形金属线圈与阻值为2R的电阻R₁连接成闭合回路，线圈的半径为r₁，在线圈中半径为r₂的圆形区域内存在垂直于线圈平面向里的匀强磁场，磁感应强度B随时间t变化的关系图线如图（b）所示．图线与横、纵轴的截距分别为t₀和B₀，导线的电阻不计．在0至t₁时间内，求：

（1）通过电阻R₁上的电流大小和方向；

（2）通过电阻R₁上的电荷量q

（3）电阻R₁上产生的热量？

有很多单位是“3个臭皮匠顶一个诸葛亮”，但也有很多单位是“3个和尚没水喝”请解释这种现象，并谈谈你的看法。