Telecommunications allows people around the World to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications devices convert different types of information, such as sound and video, into electronic signals. The signals can then be transmitted by means of media such as telephone wires or radio waves. When a signal reaches its destination, the device on the receiving end converts the electronic signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen. Telecommunications enables people to send and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for news, data, information&r
A. Telecommunications are devices and systems that transmit electronic signals across long distances.
B. Telecommunications allows people around the world to contact one another, to access information instantly, and to communicate from remote areas.
C. Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology.
D. Telecommunications are devices and systems that carry, electronic signals across short distances.
Text
While people around the world are talking about the prevention and treatment of AIDS, let’s not (26) that we have had an old enemy, cancer, which (27) sounds horrible, but also, (28) to many ordinary people, appears invincible (不可战胜的).
There (29) now both good news and bad news. The good news is that scientists (30) believe, based on the recent advances of modem medicine, (31) it is possible to tame cancer in the next decade, transforming it from a scary disease to something (32) a chronic (慢性的) disease, like diabetes. (33) no one expects a cure for cancer in the near future, but many think that the hi-tech may finally (34) more effective treatment, making the issue much (35)
The (36) news is, (37) , about the current (38) Cancer rates are expected to increase at an alarming rate globally, (39) the most recent data from the World Health O
A. where
B. place
C. which
D. when
我来回答: