有关佣金，以下叙述不正确的是( )。A．CFP Board认为佣金是指某项产品或服

把一个密度很大的小球竖直向上弹起，小球从地面开始做竖直上抛运动，测得小球从抛出到落回地面共用时间为t=3s，下列说法正确的是（g=10m/s²）（　　）

A．小球抛出的初速度大小为30m/s

B．小球上升的最大高度为15m

C．小球第2s内的位移大小为2.5m

D．小球抛出后，第1s内的位移与落地前最后1s内的位移大小相等

为加快恭王府信息一体化建设，2010年4月23日，恭王府召开了信息化建设规划论证会。会议邀请了全国文化信息资源共享工程专家咨询委员会孙承鉴、文化部信息中心高级工程师杨晓东、北京理工大学计算机应用技术系教授陆耀、中央民族大学网络中心主任肖波、北京联合大学计算机系高级实验师赵飞、故宫博物院信息中心副主任梅雪、北京中科软件有限公司技术总监李春晓等参与论证。这是公民通过______参与民主决策。[ ]

A．社情民意反映制度    

B．专家咨询制度  

C．社会听证制度    

D．座谈会

Experience the Colorado River the Hualapai Way!

River Runners offers the ONLY One Day Whitewater trip ANYWHERE at the GRAND CANYOU!

Since1973，Hualapai River Runners has been conducting whitewater rafting journey to the Colorado River. Our experienced guides expertly sail along the river and share the history of the Canyon and the Hualapai people with you.

Visitors experience the excitement of whitewater rapids and then stop to enjoy the impressive beauty of Travertine Falls and a tasty lunch．No charge for children 2 years and under.

One-Day Trip

Retail$249.00+$79.00(helicopter and round-trip ground transportation)

Whitewater rafting tours begin in Peach Springs．Hualapai River Runners transports you to Diamond Creek, which is the starting point for the 37 mile rafting tour. Lunch is included and upon arrival at the rafting tour termination point(终点)，fly out of the Grand Canyon by helicopter （直升机）to Grand Canyon West．

Two-Day Trip

Retail$549.00+$79.00(helicopter and round-trip ground transportation)

Two-day rafting trips with one night on the Colorado River. All supplies and meals are included. Two days in the Grand Canyon，on the Colorado River allows more time to explore one of the Seven Wonders of the World.

Tours Include：

●Round-trip transportation from Peach Springs to the starting point and from the termination point back to Peach Springs．  

●Snack, drinks and lunch(vegetarian meals available upon request)

●Waterproof dry bags for storing your cameras, sunscreen, dry clothes, etc．

●The helicopter part of transportation is weather permitting. If the helicopter transportation is cancelled because of bad weather, the raft will continue an additional two hours to South Cove and a maximum（最大量）$20.00 per customer will be given back.

Special Website booking rate 15% off rafting in April 2010. So book now!

Call us Toll Free Today! Tel: 1-888-868-9378

小题1:Where do whitewater rafting tours start?

A．Travertine Falls

B．Peach Springs

C．Diamond Creek

D．Grand Canyon West小题2:We learn from the passage that _______.

A．Hualapai River Runners provides dry clothes

B．you will get $20 back if you are dissatisfied

C．the trip is free of charge for children under 2

D．online booking has a better offer all year round小题3:What is the purpose of the passage?

A．To explore the Hualapai culture

B．To attract people to the sights

C．To explain how to make a rafting trip

D．To introduce the history of the Colorado River

一个递归的定义可以用递归过程求解，也可以用非递归过程求解，但单从运行时间来看，通常递归过程比非递归过程( )。

A．相同

B．较慢

C．较快

D．无法确定

按照执行任务分类，专家系统有解释型、预测型、诊断型、调试型、维修型等多种类型。