如图所示，A、B为平行板电容器的金属板，G为静电计。开始时开关s闭合，静电计指针

抗过敏药可以治疗荨麻疹，可是驾车、高空作业、精密机械操作者服用后应休息（）

A.3小时以上

B.4小时以上

C.5小时以上

D.6小时以上

E.7小时以上

六十岁男性患者，颞部2cm×2cm大小黑素斑块，略隆起于皮面，边界清楚但不规整，黑色不均匀，近2个月来缓慢增大。

根据Clark分级法，下列可定义为Ⅲ级的是（）。

A.黑素瘤细胞局限于表皮和皮肤附属器

B.侵入真皮 * * 层

C.侵入 * * 下血管丛，但未侵入真皮网状层

D.侵入真皮网状层

E.侵入皮下脂肪组织

阅读理解。

     Robert Frost was one of America's best known and most honored serious writers. But his fame came

late in his life.

     He was born in San Francisco, California in 1874. He lived in California during his early childhood. He was named after the chief Southern general in America's Civil War. The general's name was Robert

Edward Lee. The poet was named Robert Lee Frost, because his father wanted to honor the general.

     Someone once asked another American writer, Ernest Hemingway, how to become a writer. The best 

thing, he said, was to have an unhappy childhood. If this is true, Robert Frost's childhood was unhappy

enough to make him a very good writer. Robert Frost's father was a reporter who wanted to be a

politician. He often drank too much wine and became angry. Robert was the victim of his anger.

     Robert Frost finished high school in 1891. After high school, Robert's grandfather offered to pay his

costs at Dartmouth College. But Robert left the school after a few months. He did not like it. He spent the next few years working at different jobs. At one time, he worked in a factory. Later, he repaired shoes. He was a teacher. He was a reporter. Always, he wrote poetry.

     Robert Frost attended Harvard University for two years. After that, he returned to the many jobs he

held before. For a while, Frost tried to take care of a farm in the state of New Hampshire. He was not a

successful farmer. And he continued to write poetry. He said that until 1930, he earned only about ten

dollars a year from writing.

     In 1912, he decided to try to make a new start. He took his family to Britain. The cost of living was low. In Britain, Frost found a publisher for his first book of poems. The book was called A Boy's Will.

When it appeared in 1913, Frost received high praise from British readers. Praise was something he had

not received in his own country.

    Ezra Pound, another American poet living in Britain, read the poems and liked them very much. He

wrote a magazine article about Frost. He also helped get Frost's second book of poems published in

America. That book was called North of Boston.

1. The followings are writers EXCEPT __________. 

A. Robert Edward Lee    

B. Robert Lee Frost

C. Ernest Hemingway    

D. Ezra Pound

2. The passage wrote about Hemingway in order to show that __________. 

A. he had great influence on Frost's poetry and life

B. Frost's poetry style was the same as Hemingway's

C. Frost was unhappy because he was the victim of his father

D. Frost spent his childhood unhappily

3. What can we learn from the passage?

A. Once Frost's first book was published he gained great praise in his country. 

B. After leaving Harvard University, he began to learn to write poetry. 

C. Frost was found lo have a gift in poetry while he studied in high school. 

D. Robert Frost's father was angry and drank a lot because he didn't realize his dream.

4. What's the passage mainly about?

A. Robert Frost's unhappy childhood.    

B. Robert Frost' s first and second book. 

C. Robert Frost's family and jobs.        

D. Robert Frost's life and poetry.

亚氨基锂（Li₂NH）是一种储氢容量高，安全性好的固体储氢材料，其储氢原理可表示为：

Li₂NH＋H₂LiNH₂＋LiH。下列有关说法正确的是 [ ]

A.Li₂NH中N的化合价是－1

B.此法储氢和钢瓶储氢的原理相同

C.Li⁺和H^-的离子半径相等

D.该反应中H₂既是氧化剂又是还原剂

汽车的作用是什么？