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They met for the first time, but they talked happily as if they______ good friends for a long time.

A. have been B. were C.are D. had been

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It seems that people are gradually losing their smartness as smartphones become increasingly important assistants in their lives. As we rely too much on technology instead of our brains, many people have lost three basic abilities.

The first skill many people have lost is remembering phone numbers. Because phone numbers are stored in smartphone contacts, there's now no need to dial a number or look at it again. This is fine until you need to call someone for help, only to find your phone is not around.

And some people may also have lost their sense of direction because navigation apps can guide people anywhere they want. People get so dependent on them that when they can't use their smartphones, they get lost and anxious.

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1.The underlined sentence in the second paragraph implies that .

A. you are able to turn to others for help

B. others are able to call you anytime and anywhere

C. others are unable to get in touch with you by smartphone

D. you are unable to contact others without your smartphone

2. The experiment by researchers indicated that without electronic products, one could .

A. recognize more facial expressions correctly

B. lose the sense of direction frequently

C. tell different emotions immediately

D.more pictures of faces easily

3.Overusing smartphones, people will probably according to the passage

A. lose face-to-face communication skills

B. have no sense of numbers

C. weaken their senses of hearing and sight

D. fail to find their destination

4.The passage mainly tells us that many people are .

A. becoming no smarter than smartphones

B. benefiting from smartphones' intelligence

C.losing some basic abilities because of using samrtphones

D.trying hard to break away from smartphones’intelligence

5.The writer’s attitude towards electronic products is .

A.critical B.sympathetic

C.supportive D.optimistic

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The term, culture shock, describes the anxiety produced when a person moves to a completely new environment. This term expresses the lack of direction, the feeling of not knowing what to do, and not knowing what is appropriate or inappropriate. The feeling of culture shock generally sets in after the first few weeks of coming to a new place.

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He also has problems in schooling.

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A. Stage 2. B. Stage 3.

C. Stage 4. D. Stage 5.

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In a unique research cooperation between Stratasys, Education, R&D departments and MIT’s Self-Assembly Lab, a new process is being developed, known as 4D Printing.

The 4D printing concept, which allows materials to “self-assemble (自行组装)” into 3D structures, was initially proposed by Massachusetts Institute of Technology faculty member Skylar Tibbits. Tibbits and his team combined a strand (缕) of plastic with a layer made out of “smart” material that could self-assemble in water. They advanced this concept by creating materials that can change into several different complicated shapes, though this kind of material remains the bottleneck of 4D technology.

To many people that are just starting to get used to the idea of 3D printers, the name 4D is causing confusion because they cannot understand where this fourth “dimension” coming from. 4D technology shares many of the same principles of 3D printing and is essentially still about creating a new, 3D structure out of certain component; however, Tibbits states the fourth dimension at work here comes from concept of the fourth dimension of time. The difference between these 3D and 4D creations is that these new forms have the ability to transform and adapt over time.

4D printing works through self-assembly — a system where “disordered elements form an “ordered” structure via an interaction. With these 4D printed materials, these disordered materials are strands or sheets of specially designed materials. Environmental changes then stimulate (刺激)a response from them so that they form a preprogrammed shape.

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A. 4D printing creates a new, 3D structure out of certain component.

B. 4D technology reduces need for workers to put themselves at risk.

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C. providing a suitable environment

D. promoting practical applications

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C. 4D printing will benefit humans by saving labor somehow.

D. Smart materials can be transformed into other types of material.

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A. electricity is not used in 4D technology

B. 4D printing has been applied in industry

C. more potential of 4D is to be discovered

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