某工厂排出的废水加紫色石蕊试液变红色，并含有较多的可溶性铜盐，它们对人体、牲畜和

Snooker(台球)is a big sport in China．It is said that there are 300 million snooker players in China, so it's not surprised that some of the world's best players come from China．Ding Junhui is one of them．

When Ding Junhui was eight years old, there were not many snooker clubs．His father often played with his friends on a table in the street，and one day Ding Junhui played with one of his father friends and beat him．His father，a shoe salesman，discovered that his son was talented at snooker．He then took Ding Junhui to China's nation snooker training center in Dongguan，Guangdong Province．There．they lived in a room of five square meters．When they ran out of money．Ding's father phoned his wife and told her to sell their house．

After years of hard training，Ding turned professional in 2003 and became China's No．1．In 2005．more than 100 million people watched Ding Junhui win the 2005 World Snooker China Open．Since then, snooker has become more and more popular in China．

“When I was a small boy, snooker was not in the top 10 favorite sports in China，”Ding says．“Table tennis was top, followed by soccer, basketball and badminton．Now，basketball is top，but snooker is surely in the top five．”

小题1:Ding Junhui’s father usually played snooker  ---When Ding Junhui was young．

A．in a club

B．in the street

C．at home

D．in a training center小题2:Ding Junhui became the best snooker player in China          ．

A．in 2003

B．in 2005

C．when he was 6

D．when he was 8小题3:Ding Junhui and his father lived a_____ life when he was training in Dongguan．

A．rich

B．colorful

C．hard

D．modern小题4:According to Ding Junhui’s words，_________ is the top sport in China now．

A．ping-pong

B．soccer

C．snooker

D．basketball小题5:The passage mainly tells us  ____ ．

A．how to be a top player in snooker

B．what is the most popular sport in China

C．snooker player Ding Junhui's story

D．the history of snooker in China

若方程x²-mx+2m=0有两根其中一根大于3一根小于3的充要条件是______．

TCP是互联网中的传输层协议，使用 （48） 次握手协议建立连接。这种建立连接的方法可以防止 （49） 。

49（）

A．出现半连接

B．无法连接

C．产生错误的连接

D．连接失效

题18～20：

某大城市郊区有一28层的高层建筑，如图所示。地面以上高度为90m，平面为一外径26m的圆形。基本风压数值为0.50kN/m²，风荷载体型系数为0.8。

假定地面粗糙度类别为C类，已知屋面处的风振系数β₉₀=1.68，试问，屋面高度处的风荷载标准值ω_k（kN/m²）与（）项数值最为接近。

A．1.730

B．1.493

C．1.271

D．1.357

工作票注销后应保存（）个月。

A.2；

B.3；

C.4；

D.5