Access数据库中，如果在窗体上输入的数据总是取自表或查询中的字段数据，或者取自某

下图为鱼塘中鱼的数量增长曲线，为了使鱼塘的总产量达到最大值，应做到适时捕捞。下列做法中正确的是

A．超过t₄，使剩余量保持在k

B．超过t₃，使剩余量保持在3k/4

C．超过t₂，使剩余量保持在k/2

D．超过t₁，使剩余量保持在k/4

根据我国法律的规定，当几种继承之间发生冲突时，按效力的高低排列顺序应是( )。

A．法定继承，遗嘱继承和遗赠，遗赠扶养协议

B．遗嘱继承和遗赠，法定继承，遗赠扶养协议

C．遗赠扶养协议，法定继承，遗嘱继承和遗赠

D．遗赠扶养协议，遗嘱继承和遗赠，法定继承

阅读理解

     When Alexandra Holderman of Indiana was five years old, she saw a bay dressed in only a T-shirt,

diaper(尿布), and blanket in the middle of winter. Alexandra could tell that the baby was very cold. "He

had red, chapped(皲裂) skin and a runny nose," she remembers.

     That same year, Alexandra started Baby Bundles (包裹), a program to help mothers keep their

babies warm. She packed bundles of pajamas, blankets, diapers, bottles and bibs, and then delivered

them to centers for women who couldn't afford the items. Alexandra continues this program today.

     Where does Alexandra get the money for her program? The first year, family members helped a lot.

Many of them gave Alexandra money to buy supplies. Alexandra's mother, who has always encouraged

Alexandra to share her blessings with people who are less fortunate, taught her how to request donations

from stores.

     Alexandra felt shy speaking with stores' business managers at first. "But now it just comes naturally,"

she says, "and I have places that donate stuff every year." Alexandra has been doing Baby Bundles for

six years now. Each September she writes betters to stores asking for supplies and donations. Then she

makes follow-up phone calls. In October, she gathers all of the donations and goes shopping. One of the

biggest challenges is getting all of the supplies she needs while staying within a planned budget.    

Alexandra has had to give up her allowance and some time with friends, but she knows that what she's

doing helps. Sometimes she sees a baby wearing clothes like the ones she put in her bundles. And she

wonders if that baby was helped by her program. "I know that there are babies out there who are

warmer and healthier now," she says.

      Alexandra plans to continue Baby Bundles as long as she can and is currently trying to get a Web

site set up. She hopes that her work will inspire other young people to find ways to serve their

communities. Alexandra has made sure that many babies in Indiana remain cozy during the winter

months.    

1. The following things except ________ may be included in Alexandra's Baby Bundles.

A. baby clothes      

B. diapers      

C. baby caps      

D. money

2. What do you think mainly helps her program to continue?

A. Her family's money to buy supplies.

B. Her mother's encouragement.

C. Supplies and donations from stores.

D. Support from the local government.

3. What does the underlined word "allowance" mean?

A. pocket money    

B. permission      

C. salary      

D. spare time

4. According to the passage, which of the following is NOT TRUE?

A. She finds it challenging to get all of the supplies she needs with limited money.

B. Now, Alexandra is only 11years old.

C.The main purpose of her work is to inspire other young people to serve their communities.

D. Now many babies in Indiana are warmer and healthier during the winter months.

宝石中特殊的光学效应有哪几种？（星光效应、变色效应）

有A、B、0、AB四种血型，血型相同的人之间可以相互输血。具有0型血的人可以输给任何血型的人，但只能接受0型血，而不能接受其他三种血型的血；具有AB型血的人可以接受任何一种血型的血，但是只能输给AB血型的人，其他三种血型的人都不能接受AB型的血。已知赵是A型血．钱不能接受赵的血，也不能输血给赵；孙能接受赵的血，但不能输血给赵；李不能接受赵的血．却能够输血给赵。根据上述条件推断出钱、孙、李三人的血型分别是（　　）。

A．钱A，孙B，李0

B．钱B，孙0，李AB

C．钱AB，孙0，李B

D．钱B，孙AB，李0