物种繁多、结构复杂、生产力高，对环境影响大的生态系统是（）A.森林生态系统 B.湿地

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     My friend, Emma Daniels, spent the summer of 1974 traveling in Israel. During her month-long stay in

Jerusalem she often went to a caf? called Chocolate Soup. It was run by two men, one of whom - Alex -

used to live in Montreal. One morning when Emma went in for coffee, while chatting with her new friend

Alex, she mentioned that she had just finished the book she was reading and had nothing else to read. Alex said he had a wonderful book she might like, and that he'd be happy to lend it to her. As he lived just

above the caf?, he quickly ran up to get it. The book he handed to Emma just minutes later was Markings, a book by a former Secretary-General of the United Nations (UN).

     Emma had never read it, nor had she ever bought a copy. But, when she opened it up, she was floored to see her own name and address inside the cover in her own handwriting. It turned out that the summer

before, at a concert back in Montreal, Emma had met a Californian who was in town visiting friends. They decided to exchange (交换) addresses, but neither of them had any paper. The man opened up a book he was carrying in his backpack and asked Emma to write her name and address inside. When he returned to California, he left the book behind in Montreal, and his friend Alex kept it. When Alex later moved to

Jerusalem, he took the book along.

1. Alex lent Emma the book, Markings, ________.

A. to show his interest in reading

B. to show his friendliness to her

C. to tell her about the importance of the UN

D. to let her write her name and address inside

2. How did Emma feel the moment she opened the book?

A. Pleased                  

B. Satisfied

C. Worried                 

D. Surprised

3. We can learn from the text that the Californian ________.

A. met Emma at a concert

B. invited Emma to a concert

C. introduced Emma to his friend

D. left Emma his backpack

4. Who was supposed to be the first owner of the book?

A. An official of the UN

B. Alex's friend from California

C. A friend of the author's

D. A coffee shop owner

真菌大都靠什么来繁殖后代（　　）

A．孢子

B．菌丝

C．菌褶

D．细胞分裂

钨极氩弧焊的工艺参数主要有焊接电流种类及极性、焊接电流、钨极直径及端部形状、保护气体流量等，对于自动焊还包括（）。

男性，58岁。患肝硬化8年，4天前曾进行抽取腹水操作，畏寒发热、腹痛2天，体量38℃左右，全腹痛，腹部明显膨隆，尿量600ml／日．住院后经检查有以下体征，对目前病情爿断最有意义的是（）

A.腹部移动性浊音阳性

B.腹壁静脉曲张呈海蛇头样

C.脾大

D.全腹压痛及反跳痛

E.蜘蛛痣及肝掌

清查往来款项应采用的方法是( )。

A．实地盘点法
B．发函询证法
C．技术推算法
D．抽查法