已知果蝇的长翅对残翅为显性，现有长翅果蝇和残翅果蝇若干。若用它们来验证基因的分离

期货居间人是期货公司内部的客户经理。（）

　　What comes into your mind when you think about robots? Do you imagine armies of evil metal monsters planning to take over the world? Or, perhaps of mechanical men who have been created as guards or soldiers by a mad genius? Or maybe you think of man- like robots who act, think, and look like human beings. In fact robots like these have more to do with science fiction films than with real life. In the real world robots are machines that do jobs which otherwise have to be done by people. Robots either operate by themselves or under the control of a person.

　　In a car factory, for example, robot machinery can put together and paint car bodies. On the sea bed remotecontrolled（遥控）underwater machines with mechanical arms can perform tasks too difficult for divers. Robot spacecraft can explore the solar system and send back information about planets and stars.

　　Many robots have computer brains. Some robots are fitted with cameras , sensors, and microphones which enable them to see, to feel, and to hear. And some robots can even produce electronic speech.

　　All this does not mean that a robot can think and behave like a human being. Present day robots have to be programmed with a good deal of information before they can carry out even simple tasks.

　44．Robots in real life________.

　　A. can behave like human beings   B. have the ability to control the world

　　C. can think by themselves        D. can help us with a lot of work

　45．According to this article, which of the following is not true about robots in the real world?

　　A. Some robots are as creative as artists.     B. Some robots can help manufacture cars.

　　C. Some robots can see and hear.       D. Some robots can explore outer space.

　46．Robots can perform many tasks for man because________.

　　A. they have intelligence    B. they are supplied with computer programs

　　C. they can imitate human beings    D. they have the ability to learn new things

　47．The robots in science fiction films and those in real life differ mainly in________.

　　A. mentality　　 B. appearance　　 C. material　　　 D. size

焊接填充材料的选用原则（）。

A.母材的力学性能和化学成分

B.焊件的工作条件和使用性能

C.焊件的复杂程度、刚性大小、焊接坡口的制备情况和焊缝位置

D.操作工艺性、设备及施工条件、劳动生产率和经济合理性

E.焊接工人的技术能力和设备能力

2009年12月31日，国务院正式发表《关于推进（）国际旅游岛建设发展的若干意见》，该国际旅游岛建设上升为国家战略。

A.崇明

B.舟山岛

C.海南

D.黄岩

信用卡持有人可以持信用卡在特约单位购物、消费。但是，单位卡不得用于（）万元以上的商品交易、劳务供应款项的结算。

A.5

B.10

C.20

D.30