委托人不得竞买自己所委托的拍卖标的，也不能委托他人竞买。这体现了拍卖活动应当遵循的(

下列各组离子在指定环境中一定能大量共存的是 （  ）

A．使pH试纸显蓝色的溶液中：Cu^2＋、NO₃^-、Fe^3＋、SO₄^2-

B．与铝粉反应放出氢气的无色溶液中：NO₃^-、Al^3＋、Na^＋、SO₄^2-

C．使红色石蕊试纸变蓝的溶液中：SO₃^2-、CO₃^2-、Na^＋、K^＋

D．pH＝0的溶液中：Al^3＋、NH₄⁺、Ca^2＋、ClO^－

一本书a页，笑笑每天看20页，看了b天，还剩______页没看．

关于不完全性骨折的叙述哪一项是不正确的（）。

A.骨小梁部分中断不连续

B.青枝骨折属于不完全性骨折

C.属于稳定性骨折

D.一般可无骨折特有体征

E.围绕骨干均有压痛

在纸上画一幅画，即使把这张纸撕成两半，人们也能大致知道画的内容，这种知觉特性被称为( )。

A．知觉的整体性

B．知觉的恒常性

C．知觉的选择性

D．知觉的理解性

When most people travel, they spend some time booking hotel rooms. However, my friend Ashley and I were not like most people many years ago. We decided that backpacking through Ireland would be more fun if we “winged it”.

Winging it, of course, meant that we’d each buy a one-way ticket to Dublin, and give ourselves ten days to get back to Bath, England, where we were enrolled in a study-abroad program. The plan was to visit Dublin, Galway, Cong, and finally end things in Belfast, where we figured we could catch a flight back to England.

Unfortunately, Ireland had other plans for us, as nothing worked out the way in which we thought it would. After getting stuck in Galway and Cong for about seven days, we finally managed to take a bus trip from Cong to Belfast. The twelve-hour bus ride started at ten in the morning, which meant that we’d arrive in the heart of Belfast at around ten at night. Of course, like all transport, the bus ran late, and we ended up in Belfast at around eleven-thirty at night. As there were a ton of hotels around the area where it dropped us off, we weren’t too worried about finding a hotel room. But hotel after hotel turned us down.

After the third hotel turned us down and the fourth one was locked up for the night, Ashley and I started to realize that we had to spend a long night sleeping on a city bench. Like militant soldiers, we slept in turn as we were worried we would get robbed. The system worked, as we were able to stay safe while catching as much sleep as we could on the bench.

From this experience, I really learnt a good lesson.

小题1:Why did the author and his friend decide to wing it when they went to travel in Ireland? (No more than 8 words)

小题2:What did the author and his friend do in Bath, England? (No more than 8 words)

小题3:How long did it take the author and his friend to get to Belfast from Cong by bus? (No more than 5 words)

小题4:Why did the author and his friend have to take turns to sleep? (No more than 8 words)