乙醇的毒性级别是（）。A、高毒 B、中等毒性 C、低毒 D、微毒

下列文句空缺处依次所填词语正确的一项是（ ）

①.钱（学森）是卡门最得意的学生，美国政府也可以授予他这一（ ）。

②.我只能按照钱老规定的原则，（ ）。

③.他和全民族都遭受日本侵略带来的（ ）。

④.曾令世人惊奇而（ ）的古都业已消失。

A．名誉婉言谢绝痛楚感慨万千

B．荣誉婉言谢绝痛苦叹为观止

C．荣誉一概回绝痛楚感慨万千

D．名誉一概回绝痛苦叹为观止

A boy called Mario had many friends, and he was proud of it. Whoever he met, he would like to show off(炫耀) how popular he was at school.

One day, his grandpa said to him, “Mario, I know that you don’t have as many friends as you think. Many of them are not true to you.”

Mario thought maybe his grandpa was right. However, he wasn’t sure how he could test whether his schoolmates were real friends or not, so he asked his grandpa. The old man answered, “I have just exactly what you need. It’s in my room. Wait a minute.” The old man left, soon returning as if(好像) carrying something in his hand, but Mario could see nothing there.

“Take it. It’s a very special chair. Because it’s invisible, it will be hard for you to sit on it. However, if you manage to sit on it, you can use the chair’s magic power（力量） to tell who your real friends are.”

Mario took the strange invisible chair to school. At break time he asked everyone to form a circle, and he put himself in the middle, with his chair.

“Nobody move. You’re about to see something amazing，” said Mario. Then he tried sitting on the chair. Having difficulty seeing it, he missed and fell to the ground. Everyone had a pretty good laugh. “Wait, wait,” said Mario, making another try. But again he missed the seat.

Mario didn’t give up. He kept trying to sit on the magic chair. Finally, he did it. This time he felt himself in mid-air.

Then he experienced the magic that his grandpa had been talking about. Looking around, Mario saw George, Lucas and Diana holding him up, so he wouldn’t fall. But some schoolmates whom he had regarded as friends had done nothing but made fun of him. Mario was quite thankful to his grandpa, who helped him test who his true friends were.

小题1:Mario’s grandpa gave him a special chair to _____.

A．sit on in the school

B．be his birthday present

C．test who his true friends are

D．play games with his friends at school小题2:What does the underlined word “invisible” mean in Chinese in the passage?

A．感激的

B．有帮助的

C．神奇的

D．看不见的小题3:Mario succeeded in sitting on his chair finally because_____.

A．his friends taught him

B．he had tried many times

C．his friends held him

D．the chair had magic power小题4:Which would be the best title（标题）for this story?

A．A Magic Chair

B．A Kind Grandpa

C．Mario’s True Friends

D．How to Test Friends

为了使类中的某个成员不能被类的对象通过成员操作符访问，则不能把该成员的访问权限定义为

A．public

B．protected

C．private

D．static

腮腺良性肿瘤中最常见（）。

A.单形性腺瘤

B.多形性腺瘤

C.Warthin瘤

D.良性混合瘤

E.肌上皮瘤

形象意义