保罗书信是怎样分类的？

阅读理解

       Julia Hill, an American woman, was born in 1974. She was 23 years old when she discovered that a

company wanted to cut down part of a forest in California. In the forest there were lots of redwood trees. One of the trees was 70 meters tall and 1,000 years old. 

       Julia wasn’t happy about this. She traveled to California and climbed up the tree. “If I sit in the

tree.” she said, “the company can’t cut it down.” At the beginning, Julia planned to stay in the tree

for two weeks. She lived in a small tree-house and her friends were very helpful---they cooked food for

her every day. She used her mobile phone to talk to her family and to news reporters. She stayed in the

tree day and night. 

       Environmental organizations supported her, but other people weren't on her side and they tried to stop her. The company used a helicopter that stayed near her tree-house for a long time.  The helicopter(直升飞机)Was very noisy and there was a lot of wind. Julia didn’t like it, but she stayed in the tree. 

       In the end, she was successful. The company agreed not to cut down the redwood.  Finally, after two years and eight days in the tree, Julia Hill climbed down and walked on the ground again. She and her

friends were very happy.

1. What nationality(国籍) is Julia Hill?

A. She is from America.    

B. She is from California.

C. She is from England.  

D. She is from China.

2. Julia kept in touch with others while staying high up in the tree by _____.

A. writing letters                      

B. watching TV

C. using mobile phone                

D. nothing

3. Julia climbed down the tree _____.

A. after the company got to the forest

B. after she saw the helicopter

C. after two weeks

D. after the company agreed not to cut down the redwood

4. Julia stayed in the tree ______.

A. with her friends                    

B. with her family

C. for two weeks                    

D. for two years and eight days

5. Why did Julia Hill stay in the tree?

A. Because she liked living in the tree.

B. Because she wanted to protect the trees.

C. Because environmental organizations supported her.

D. Because she wanted to buy the redwood trees.

免疫固定电泳是下列哪两种技术的结合（）

A.区带电泳+免疫沉淀反应

B.区带电泳+免疫凝集反应

C.免疫双扩散+区带电泳

D.免疫单扩散+区带电泳

E.免疫双扩散+免疫凝集反应

下面不属于税务机关的义务的是( )。

A．检查纳税人的账簿、记账凭证、报表和有关资料，检查扣缴义务人代扣代缴、代收代缴税款账簿，记账凭证和有关资料

B．税务机关查询所获得的资料，不得用于税收以外的用途

C．税务检查的对象，涉及被检查者的商业秘密，必须慎重进行，并有责任为被检查人保守秘密

D．税务机关派人执行税务检查时，必须出示税务检查证件，包括税务检查证和税务检查通知书。未出示税务检查证和税务检查通知书的，被检查人有权拒绝检查

MIMO技术指的是什么？如何实现？