问题 单项选择题

转基因作物同普通植物的区别只是多了能使它产生额外特性的基因.早在1983年,生物学家就已经知道怎样通过生物工程技术将外来基因移植到某种植物的脱氧核糖核酸中去,以便使它产生靠杂交方式根本无法获得的某种新的特性:抗除莠剂的特性、抗植物病毒的特性、抗某种害虫的特性等.用以移植的基因可来自任何生命体:细菌、病毒、昆虫等.转基因作物目前在世界上已种植有1 000万公顷左右,种植最多的是棉花、玉米和西红柿等.在实验室试种的还有莴笋、西瓜、稻谷等品种.试验的目的除了增产之外,还在于提高这种品种的抗病毒能力.但同时也有专家担心转基因作物可能对环境有危险.比如在美国种植的那种能抗虫害的玉米和棉花,可能加快出现一更难对付的害虫.这类作物的所有分子都分泌出一微量的“杀虫”一种像任何一种一样能选择杀死某害虫的“雾剂”.尤其是那些能抗除莠剂的作物,它们一旦同野生状态下的“表姐妹”杂交之后,那些“表姐妹"也就会因此而成为除莠剂无法除掉的变种了对于这种技术,尽管还有些问题需要继续研究,但这确是人类9000年作物栽培史上一场空前的革命.

对文中所提供的信息,理解不正确的是______.

A.生物学家知道怎样通过转基因技术使作物产生抗除莠剂等特性不过十多年时间

B.转基因作物可能给环境带来危险是转基因研究中不容忽视的问题

C.野生植物同抗除莠剂作物杂交之后的变种已经给农业生产带来新问题

D.转基因是一种新的生物工程技术,它给作物栽培带来从未有过的根本改革

答案

参考答案:C

解析:依照文中“尤其是那些能抗除莠剂的作物,它们一旦同野生状态下的‘表姐妹’杂交之后,那些‘表姐妹’也就会因此而成为除莠剂无法除掉的变种了."应是能抗除莠剂的野生作物.

完形填空
完型填空(每小题1.5分,满分30分)
Charlie and Jackie joined a wholesale company together just after graduation. Both worked very hard. After several years, the bosses promote Jackie to sales executive but Charlie_46_ a salesman. One day Charlie could not __47_ it anymore, tendered his resignation(辞职书) to the boss and complained the boss did not __48__ hard working staff, but only promoted those who flattered him. He thought it was really __49__.
The boss knew that Charlie had spared no _50___ for the company all these years, but in order to help Charlie realize the __51__ between him and Jackie, the boss ask Charlie to do the _52___: “go and find out if anyone is selling watermelon in the market.” Charlie returned and __53__ said yes. the boss asked.“how much per kg?” Charlie went back to the market to ask and returned to ___54__ $12 per kg.
The boss told Charlie that we would ask Jackie the _55___ question. Jackie went, returned and said,“boss, only one person is selling watermelon, $12 per kg, $100 for 10kg.he has a _56___ of 340 melons. on the table 58 melons and every melon weighs about 15kg,_57____ from the South two days ago. they are fresh, red and of good __58__ .” Charlie was _59____ and realized the difference between himself and Jackie. he decided not to __60___ but to learn from Jackie.
小题1:
A.madeB.becauseC.remainedD.kept
小题2:
A.takeB.doC.getD.put
小题3:
A.enjoyB.meetC.replyD.value
小题4:
A.unusualB.unfairC.carelessD.selfless
小题5:
A.rest.B.troubleC.effectD.effort
小题6:
A.competitionB.relationshipC.differenceD.distance
小题7:
A.following.B.findingC.shoppingD.searching
小题8:
A.stillB.againC.evenD.only
小题9:
A.offer.B.answerC.remindD.repeat
小题10:
A.difficult.B.familiarC.sameD.simple
小题11:
A.totalB.lotC.pileD.number
小题12:
A.takenB.comeC.boughtD.heard
小题13:
A.valueB.qualityC.conditionD.shape
小题14:
A.struckB.movedC.puzzledD.encouraged
小题15:
A.stayB.stopC.workD.leave
单项选择题