急性心梗第3周出现发热和心包摩擦音，血沉30mm/h，血白细胞6.1×109/L，中

生物多样性的实质是：(    )

A．生物基因的多样性

B．生态系统的多样性

C．自然环境的多样性

D．生物种类的多样性

阅读理解

     A teacher of English as a second language is the 2004 Teacher of the Year in the United States .

Kathy Mellor of Rhode Island will spend the next year as an international spokeswoman for education.

President Bush and his wife, Laura ,honored her during a ceremony(仪式)at the White House last

week.

    For the past nineteen years ,Kathy Mellor has taught English as a second language at Davisville

Middle School in North Kingstown, Rhode Island ,in the northeastern United States .She redesigned

the program for E.S.L students at her school to provide each student with one to three periods per day

in classes for English learners .How much instruction the students get depends on their level of skill in

listening ,speaking ,reading and writing. The amount of time they spend in these classes in reduced as

their level of English increases.

    A teacher describes this as the most successful E.S.L. program in North Kingstown. She also praises

Kathy Mellor for providing help to students and their families by forming a local parents group for

speakers of other languages .This improved their ability to help their children.

    Kathy Mellor earned a master's degree in education from Rhode Island College. She studied teaching

English as a second language.

   She was chosen for the national honor of Teacher of the Year from among top teachers in each of the

fifty states .As Teacher of the Year ,Kathy Mellor will travel around the United States and to other

countries .She will talk about the importance of education and the work of teachers.

1. This passage is mainly about________.

A. Teacher of the Year 2004 in the United States    

B. Ms Mellor's English teaching instruction

C. Ms Mellor's teaching skills of learning English  

D. praises to Ms Mellor from other teachers

2. What does "E.S.L." in the passage stand for?   

A. English study learners.            

B. English speaking and listening.

C. English special learners.            

D. English as a second language.

3. From this passage we can learn that ________. 

A. middle school teachers from each state are honored Teachers of the Year

B. middle school teachers in the USA have to get master's degrees

C. Ms Mellor's students have no problems in learning English

D. the American government pays much attention to education

有效汽蚀余量小，则泵运行的抗汽蚀性能就好。

设有语句：if(a==1)b=2；c=3；，以下语句中与之等价的是( )。

A．if(a==1){b=2；c=3；}

B．if(a!=1){；}else{b=2；c=3；}

C．if(a=1)c=3；b=2；

D．(a==1)b=2:a:=a；c=3；

Access为使用外部数据源的数据提供了哪两种方式创建表各自在什么情况下使用