替代途径的C3转化酶是（）。 A.C4b2a B.C3bBbP C.C5a D.C4

2009年3月在北京召开的“两会”期间，来自全国各地的代表纷纷提出《中国发展循环经济的理论与实践》议案。据此完成问题。

小题1:促使我国发展循环经济、走可持续发展之路的主要原因是(　　)

A．古代可持续发展思想对当代人的影响和熏陶深刻而又长久

B．很多地区资源严重短缺，工农业经济生产受到严重影响

C．人口、资源、环境问题使我国社会生存和发展面临巨大的压力

D．人口基数过高，人均国内生产总值低于世界平均水平小题2:从可持续发展的角度看，下列生产活动符合循环经济的是(　　)

A．秸秆焚烧还田

B．矿渣生产水泥

C．垃圾转移国外

D．污水灌溉农田

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

Popular music in America is what every student likes． Students carry small radios with earphones and listen to music before class, after class, and at lunch． Students with cars buy large speakers and play music loudly as they drive on the street． Adult drivers listen to music on the car radio as they drive to work． They also listen to the news about sports, the weather, and the life of American people． Most of the radio programmes are music．

Pop or popular music singers make much money． They make CDs or tapes which radio stations in many places broadcast（广播）． Once the popular singer is heard all over the country, young people buy his or her tapes． Some of the money from these tapes comes to the singer． Wherever the singer goes, all the young people want to meet him or her． Now the singer has become a pop star．

There are other kinds of music that are popular among Americans． One is called folk music． It tells stories about the common life of Americans． Another is called western or country music． This was started by cowboys who would sing at night to the cows they were watching． Today, any music about country life and the love between a country boy and his girl is called western or country music．

小题1:________ kinds of music are mentioned(提到) in this passage．

A．Two

B．Four．

C．Three

D．Five小题2:When pop singers ________, they are regarded as pop stars．

A．become popular with their fans

B．make a CD or tape

C．make much money

D．are wanted to sing on the radio小题3:From the passage we know that country music is about ________．

A．the common life of Americans

B．the life of cowboys

C．the country life and love stories

D．the school life in America小题4:What would be the best title for this passage？

A．Western Music

B．Popular Music

C．History of Music

D．American Music

在数控机床中，刀具的最小移动单位是（）

A.0.1mm

B.0.01mm

C.1个脉冲当量

D.0.001m

必须在应收模块核算的科目有（）

A.营业款结算

B.暂估收款-未核销收款

C.暂估收款-未标识收款

D.暂估收款-记账收款科目等