基因工程技术引起的生物变异属于[ ] A．染色体变异 B．基因突变 C．基因重组

用换元法解分式方程 x2-2 x + 2x x2-2 =3时，如果设y= x2-2 x ，那么原方程可化为关于y的一元二次方程的一般形式是______．

阅读下面这首唐诗，完成题目。

1．本诗中的“疑”、“急”表现了小童怎样的心理状态？请简要分析。

答：________________________________________________

2．本诗运用了怎样的写作手法？表现了怎样的意境？

答：________________________________________________

When in 1789, George Washington became the first president of the United States, there was no permanent capital in which to house the government. During the Revolutionary War several different cities had served as the national capital. In addition, members of congress could not agree as to where this permanent capital should be located. Some officials wanted it in the north, others wanted it in the south. Each of the states hoped that the capital might lie within its own state lines. At last it was decided that the capital should occupy a section by itself, separate from any of the states. The place chosen was situated on the Potomac River. The land belonged originally to the state of Maryland, but Maryland agreed to the national government. The section was named the Washington. Work was begun on the new capital in 1791. in the year 1899 Congress occupied the new capital building at the same time the White House was opened as the home of all future presidents.

小题1:Before the year 1800, the capital of America had been located in _______.

A．Maryland

B．Washington

C．New York

D．several cities小题2:Why was it decided that the capital should be separated from any of the states? Because ________.

A．the District of Columbia was on the borders of several states

B．the District of Columbia was in the center of America

C．Maryland insisted that the capital lie in its own state

D．Each of the states wanted the capital might lie within its own state小题3:The capital was named after _______.

A．an explorer, who first found the place

B．the place where it occupied

C．the first president of the United States of America

D．a famous general who fought in the war小题4:Presidents of the United States live in ________.

A．the capital building

B．Maryland

C．New York

D．the White House

跨流域调水或跨省份调水生态影响评价重点与水库的生态影响评价重点不同之处是 ( )。

A．对受益区长期的生态影响进行评价

B．对调出区长期的生态影响进行评价

C．对国内外同类项目进行类比调查并写出评价报告

D．预测连接区随着宏观环境的变化给动植物和人类带来的影响

E．预测调出区、调入区随着宏观环境的变化给动植物和人类带来的影响

自助行为是指权利人受到不法侵害之后，为保全或者恢复自己的权利，在情势紧迫而不能及时请求国家机关予以救助的情况下，依靠自己的力量，对他人的财产或自由施加扣押、拘束或其他相应措施的行为。
依据上述定义，下列行为中属于自助行为的是______。

A．高某住在某旅店，住店5天未付房钱就要离开旅店去车站，旅店服务员见状揪住高某不让其走，并打报警电话
B．甲趁乙不在的时候将乙家的玻璃砸碎，乙得知后也到甲家中将其同样规格型号的玻璃砸碎
C．陈某抢劫出租车司机李某，用匕首刺李某一刀，强行抢走财物后下车逃跑。李某发动汽车追赶，在陈某往前跑了40米处将其撞成重伤并夺回财物
D．甲为救助自家和邻居被突袭而来的洪水所围困的财物，未经乙同意，使用乙的小船