哪项是有机磷中毒的机制（） A.乙酰胆碱活性降低，胆碱酯酶积聚 B.胆碱酯酶活性降低

（10分）（选修5 自然灾害与防治）2003年6月下旬至7月中旬，淮河流域出现了自1991年以来最大的一次洪水。为缓解水位上涨压力，政府启用安徽省境内部分蓄洪区实行分洪，安全搬迁群众4.6万人；还启用了怀洪新河分洪等措施（图10）。完成下列要求。

小题1:说明形成这次大洪水的主要原因。（4分）

小题2:说明蓄洪区分洪的作用及临淮岗洪水控制工程、怀洪新河的主要功能。（6分）

Opened in 1971, the Magic Kingdom was the first theme park at Walt Disney World. All Disney World theme parks are open 365 days a year, although opening and closing times for each park are different from day to day. If  you are traveling without kids, try to visit it on a school day to avoid the largest crowds. If you need to visit it during a school vacation, try at least to avoid the week between Christmas and New Year’s Day and the Fourth of July.

If you are not staying at a Disney World hotel, avoid visiting the Magic Kingdom on its Extra Magic Hours days. The hotel guests get into the park early on those days, increasing the waiting time for visitors who arrive at the normal opening time.

Buy your Walt Disney World tickets online at Disney World’s website. There will be some advice on picking the right ticket. See the guide to Disney World tickets. You will also need to call in advance to make lunch or dinner reservations (预订). Disney accepts reservations, through 1-407-WDW-DINE, up to 180 days in advance. Time does pass quickly, so you should call six months before your trip to get a lunch reservation in the castle. We suggest you should have your lunch at Cinderella’s Royal Table for your tour. If you can’t get the reservation, ask for the Liberty Tree Tavern instead.

Keep in mind that to reach the Magic Kingdom, you must park at Disney World’s Transportation and Ticket Center (TTC) parking lot, take a tram (有轨电车), and then take a boat across the Seven Seas Lagoon to the Magic Kingdom.

小题1:We learn from the passage that ______.

A．children are not allowed to visit Disney World on New Year’s Day

B．Disney World theme parks have the same opening and closing times

C．a single adult had better visit the Magic Kingdom on a school day

D．the Magic Kingdom was the earliest theme park in the world小题2:If you want to have dinner in the Walt Disney World, you can ______.

A．see the guide to Disney World tickets to reserve a table

B．make a call to reserve a table for dinner in advance

C．use 1-407-WDW-DINE to reserve about 3 months in advance

D．go to Cinderella’s Royal Table or the Liberty Tree Tavern at any time you like小题3:Which of the following is TRUE according to passage?

A．Disney World theme parks will be closed on Christmas Day.

B．The only way to get Walt Disney World tickets is to buy them online.

C．Visitors have to reach the Magic Kingdom by tram and then boat.

D．The Magic Kingdom has Extra Magic Hours every day.小题4:What would be the best title for this passage?

A．The History of the Magic Kingdom

B．A Brief Introduction to the Magic Kingdom

C．Advice on Making a Trip to the Magic Kingdom

D．The Most Important Theme Park at Walt Disney World

美国历史上第二次资产阶级革命取得的最重要成果是[ ]

A．赢得了国家的独立

B．开创了民主政治制度

C．维护了国家的统一

D．使美国成为世界强国

管理交底内容主要包括什么？