Microsoft公司面向高端的DBMS是（）。A.ACCESS B.SQL SER

阅读理解。

     The Greens live at 87 King Street. In the morning, Mr. Green goes to work and the children go to school.

Their father takes them to school every day. Mrs. Green stays at home every day. She does housework. She

eats her lunch at noon. In the afternoon, she usually sees her friends. They often drink tea together. The

children come home from school at about five. They get home early. In the evening, the children always do

their homework. Then they go to bed. Mr. Green usually reads his newspaper, but sometimes he and his wife

watch TV.

     On Sunday afternoon, Mrs. Green usually goes shopping. And the children often help their mother do

housework at home.

1. The children's father takes them to _____ every day.

A. market

B. work

C. school

D. his friend's

2. Mrs. Green _____ after she has lunch.

A. does housework

B. stays at home

C. drinks tea

D. sees her friends

3. The children _____ early.

 A. go to school

B. come home

C. go to bed

D. leave home

4. Sometimes Mr. and Mrs. Green _____ in the evening.

A. read newspapers

B. go to work

C. do their homework

D. watch TV

5. The children often _____ their mother _____ on Sundays.

A. help; do housework

B. ask; do housework

C. order; go shopping

D. help; go shopping

（1）分解下列因式，将结果直接写在横线上：

x²-6x+9=______，25x²+10x+1=______，4x²+12x+9=______．

（2）观察上述三个多项式的系数，有（-6）²=4×1×9，10²=4×25×1，12²=4×4×9，于是小明猜测：若多项式ax²+bx+c（a＞0）是完全平方式，那么系数a、b、c之间一定存在某种关系．请你用数学式子表示小明的猜想．______（说明：如果你没能猜出结果，就请你再写出一个与（1）中不同的完全平方式，并写出这个式中个系数之间的关系．）

（3）若多项式x²+ax+c和x²+cx+a都是完全平方式，利用（2）中的规律求ac的值．

13的因数只有13个。[ ]

窦性心动过速不发生于哪种情况（）

A.发热

B.甲状腺功能亢进症

C.运动

D.贫血

E.甲状腺功能减退症

决策就是为未来的行为制定( )的方案，并决定采用某种方案的过程。

A．实现目标

B．一种可行性

C．多种可供选择

D．效益最大化