How long has 3-D technology been around? Most of us might think of crowds of teenagers in a 1950’s movie house watching Bwana Devil in 3-D. But 3-D technology made its first appearance on the scene in 1838 with the first stereoscope(體視鏡). And the first actual 3-D movie was a 1903 film called Le Ariveed’un Train.

Although it has such a long history, the technology has still remained based on one simple principle-----to make 3-D effects you must find a way to project two slightly different pictures to each eye. Modern 3-D technology works by rapidly flickering(閃動) two versions of the movie and projecting them onto each eye. The brain does the rest of the work, combining the two pictures together into one and giving the show the appearance of depth, the third dimension.

But does this exposure, especially long exposures, cause harm to the child’s developing brain and visual system? Unfortunately, long-term studies on new flicker digital 3-D technology and children aren’t yet available. We do not know if regular or daily 3-D viewing over years affects the developing visual system, although older 3-D methods basically do the same thing and are not considered harmful.

The question of possible harm in modern 3-D use in TV is really based on two facts: the amount of time children will now be watching 3-D TV each day and the sensitivity some children show in reaction to 3-D viewing. It is difficult to make actual lab studies of longer term 3-D viewing in children because of the possible harm of the experiment. Researchers will have to wait until 3-D TV technology is already in the marketplace for a number of years, then check heavy 3-D TV watchers and compare them with non-watchers.

With a 3-D television technology in the home, we will soon be able to answer the question of whether or not longer and more frequent periods of 3-D exposure cause more changes in the visual system. We may find that the bigger problem is the introduction of a new technology that leads to even more time spent on TV rather than playing outdoors.

1.According to the text, 3-D technology ______

A. was refused by people when it first appeared.

B. will soon change the way we watch TV.

C. does no good to our visual system.

D. has a history of nearly 200 years.

2.Paragraph 2 is mainly about________

A. how 3-D technology works.

B. why 3-D movies are popular

C. the history of 3-D technology.

D. the influence of 3-D technology.

3.What’s the method suggested in paragraph 4?

A. To wait and see B. To carry out lab studies

C. To stop making 3-D movies D. To improve 3-D technology

4.The author’s purpose in writing the text is to _______

A. ask children not to watch 3-D movies

B. discuss if 3-D viewing is harmful to children.

C. introduce the advantages of 3-D technology.

D. predict the development of 3-D technology.

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"In our computer age，some people believe that we don't have to teach spelling because we have spell checks，"she said．"But until a child has a functional spelling ability of about a fifth grade level，they won't have the knowledge to choose the correct spelling among the options given by the computer．"
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D．The popular use of smartphones．
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A．focused on the difference between writing by hand and on a computer．
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D．discussed the importance of writing speed．
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31．What conclusion could be drawn from the passage？C
A．Computers can help people with their choice of words．
B．Spell checks can take the place of spelling teaching．
C．Handwriting still has a place in today's classrooms．
D．Functional spelling ability develops fast in the fifth grade．

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