问题 单项选择题

某工程监理合同履行中,委托人与科研机构的试验室签订了负责施工期间材料和工艺质量检测试验的技术服务合同。按照建设工程委托监理合同示范文本的规定,下列关于监理人工作的说法中,不正确的是()。

A.试验室应接受监理人的指示,完成要求进行的检测试验项目

B.监理人应监督试验过程,对试验数据的正确性承担连带责任

C.监理人对依据不准确的试验数据作出的错误判断,不承担责任

D.试验数据正确,监理人作出错误判断应承担责任

答案

参考答案:B

填空题

玉米子粒的胚乳黄色(A)对白色(a)为显性,非糯(B)对糯(b)为显性。两对性状自由组合。今有两种基因型纯合的玉米子粒,其表现型分别为:黄色非糯、白色糯。

(1)请用以上两种玉米子粒作为亲本,通过杂交试验获得4种子粒表现型分别为黄色非糯、黄色糯、白色非糯、白色糯,比例接近1:1:1:1(用遗传图解回答)。若亲本不变,要获得上述4种子粒,但比例接近9:3:3:1,则这个杂交试验与前一个杂交试验的主要区别是什么?(用文字回答)

(2)如果上述的白色糯玉米不抗某种除草剂,纯合黄色非糯玉米抗该除草剂其抗性基因位于叶绿体DNA上,那么,如何用这两种玉米作亲本通过杂交试验获得抗该除草剂的白色糯玉米? 

(3)现有多株白色糯玉米,对其花粉进行射线处理后,再进行自交。另一些白色糯玉米植株,花粉不经过射线处理,进行自交。结果,前者出现黄色糯子粒,后者全部洁白色糯子粒。由此可推测,黄色子粒的出现是基因发生__________的结果,其实质是射线诱发___________的分子结构发生了改变。 

(4)在适宜时期,取基因型杂合黄色非糯植株(体细胞染色体为20条)的花粉进行离体培养,对获得的幼苗用___________进行处理,得到一批可育的植株,其染色体数为__________这些植株均自交,所得子粒性状在同一植株上表现___________(一致、不一致),在植株群体中表现___________(一致、不一致)。

(5)采用基因工程技术改良上述玉米的品质时,选用大豆种子贮藏蛋白基因为目的基因。该目的基因与作为___________的质粒组装成为重组DNA分子时,需要用__________和连接酶。为便于筛选获得了目的基因的受体细胞,所用的质粒通常具有__________。将目的基因导入离体的玉米体细胞后,需要采用__________技术才能获得具有目的基因的玉米植株。

阅读理解

Taking the train is a wonderful way to see America. In the 19th century, train routes appeared from coast to coast, carrying both people and goods Today, a long-distance Amtrak train trip is a different way to experience the United States.

The long-distance Amtrak trains have lots of room. Coach seats have lots of leg room and wide aisles(走廊),sightseeing lounges(休闲室) have large windows, and sleeping areas can provide a good night’s rest. On a train trip, there’s time to talk, play cards or board games, and read to one another. On a car trip, parents have to drive while on a train, parents can sit back and watch the scenery go by. Unlike an airplane, traveling by train is not the quickest way to arrive at your destination; the train is the destination in itself.

Amtrak manages long-distance trains that run through the United States. Routes have different names, such as Empire Builder, California Zephyr, Sunset Limited and Southwest Chief. The long-distance trains have double-decker cars(Superliners), sightseeing lounges, and a real dining car. On shorter trains, such as from New York to Washington. DC, the cars are single level and only have a snack bar. In the Superliner trains, the sightseeing lounge is lined with windows on the second level while on the lower level a snack bar and tables can be found. In the evening, videos are shown in the lounge car—either entertaining movies or documentaries.

Tip: As delays are common on Amtrak trains, always call the station before you go there. Otherwise, you may be cooling your heels(脚后跟) for hours.

小题1:What’s the advantage of seeing America by train?

A.There are more services on the train than any other

B.Traveling by train is the quickest way to reach your destination.

C.Traveling by train gives people more time to see and do things.

D.The trains like Amtrak allow people to enjoy the journey cheaply.小题2:Which of the following can be found on short-distance Amtrak trains?

A.Sleeping areas.

B.Snack bars.

C.Sightseeing lounges.

D.Coach seats.小题3:What does the underlined sentence in the last paragraph mean?

A.You will have to wait.

B.You make your heel cool.

C.You will have no place to stand on the train.

D.Your feet will be hurt on the train.小题4:Which of the following about Superliners is true?

A.There are lines of windows on the lower level.

B.The snack bar is on the higher level.

C.A sightseeing lounge is on the upper level.

D.Both levels are equipped with videos.