Text 2
Each advance in microscopic technique has provided scientists with new perspectives on the function of living organisms and the nature of matter itself. The invention of the visible-light microscope late in the sixteenth century introduced a previously unknown realm of single celled plants and animals. In the twentieth century, electron microscope have provided direct views of viruses and minuscule surface structures. Now another type of microscope, one that utilizes X rays rather than light or electrons, offers a different way of examining tiny de tails; it should extend human perception still farther into the natural world.
The dream of building an X-ray microscope dates to 1895; its development, however, was virtually halted in the 1940’ s because the development of the electron microscope was progressing rapidly. During the 1940’ s, electron microscopes routinely achieved resolution better than that possible with a visible-light micro
A. They will probably replace electron microscopes altogether.
B. They will eventually he much cheaper to produce than they are now.
C. They will provide information not available from other kinds of microscopes.
D. They will eventually change the illumination range that they now use.
Passage Two
Eye contact is a nonverbal technique that helps the speaker "sell" his or her ideas to an audience. Besides its persuasive powers, eye contact helps hold listeners’ interest. A successful speaker must maintain eye contact with an audience. To have good rapport (关系) with listeners, a speaker should maintain direct eye contact for at least 75 percent of the time. Some speakers focus exclusively on their notes. Others gaze over the heads of their listeners. Both are likely to lose audience interest and esteem. People who maintain eye contact while speaking, whether from a podium (演讲台) or from across the table are "regarded not only as exceptionally well-disposed by their target but also as more believable and earnest."
To show the potency of eye contact in daily life, we have only to consider how passersby behave when their glances happen to meet on the street. At one extreme are those people who feel obliged to smile when
A. the importance of eye contact
B. the potency of nonverbal techniques
C. successful speech delivery
D. an effective way to gain visual feedbacks
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