1.C【解析】由题意得一p为3x>0,x2一x十1≤0. 2.A【解析】因为集合A={x|0

1.A【解析】设f(x)=x■.则f(3)=3”=27,解得m=3,则f(x)=x3,故f(2)=8. 2.D【解析】(a7-a-)2=a十a1-2=4,所以aT-a-寸=±2.

l.A细节理解题。根据Paris部分中的But whattravelers really love are the old-fashioned cafes,livelymarkets and trendy shopping districts.可知，巴黎是购物...

L.A细节理解题。由Camel Trail中With the highestnumber of excellent reviews on TripAdvisor and 96%traffic free,we're certain you'll have a great time,可...

l.A细节理解题，根据Personalized Day Tour in theNetherlands部分第一句Gain close insight into theNetherlands'artistic works on this private walk tourfro...

l.B细节理解题.根据Poly Art Museum部分中的Themost recently recovered animal heads,the rat and therabbit.are currently housed at the National Museum ofC...

l.B细节理解题。根据第二段Racing is simple..和第三Dog sledding is one of the fastest growing sports onthe east coast of Australia.和第四段Participantsc...

一、选泽澳7.01.B【解析】因为(1一i)(1一x)=1十i,所以1一之=(1+i)21+2i-1(1-i)(1+i)2=i,所以：=1-i,所以之=1十i,所以：的虚部为1. 2.A【解析】因为a⊥b,所以a·...

l.C细节理解题。根据David Sheldrick Wildlife Trust中Dr.Dame Daphne Sheldrick started the organizationin 1977 in memory of her late husband,the famousna...

GMm4π21.C【解析】根据F万=r2=mT2rma,解4π2r3GMGMm得T=,a=,依题意，空间站GMr2的轨道半径小于同步卫星的轨道半径，可知空间站的运行周期小于同步卫星的周期，空...

1.D【解析】蛋白质的结构因氨基酸种类、数目和排列顺序不同而具有多样性：细胞膜上具有主动运输功能的载体能够运输物质，也能够催化ATP水解：蛋白质在碱性条件下...

1.D【解析】溶酶体内含多种水解酶，这些酶由核糖体合成，不是由溶酶体合成的：人体内能形成囊泡的细胞器有内质网、高尔基体，细胞膜能形成囊泡，但不属于细胞器...