2. 外语
  3. It is the firm belief of astronomers【C1】______there are living creatures on other planets. It is also their ear- nest wish that

It is the firm belief of astronomers【C1】______there are living creatures on other planets. It is also their ear- nest wish that

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问题     It is the firm belief of astronomers【C1】______there are living creatures on other planets. It is also their ear- nest wish that some day【C2】______may be made with such living creatures【C3】______sending messages in the form of radio signals. The【C4】______of communicating with people on other planets may one day come【C5】______since radio telescopes【C6】______.
    Scientific project of various kinds are now being launched to【C7】______signals or to receive signals from distant planets.      The question now【C8】______: What sort of message【C9】______so that it could be understood? To send a message in any language would be impractical【C10】______it would【C11】______not be intelligible.
It is the opinion of scientists that a signal in the【C12】______of a simple arithmetic sequence might be understood.
    Scientists think that pictures might also be understood, so it【C13】______a good idea to send pictures of the people【C14】______our planet. Pictures of domestic animals together with【C15】______crops we【C16】______for our food might also be【C17】______. Pictures of houses and buildings might【C18】______further information about our life and society.
    As time goes on, TV pictures might be sent, which would【C19】______acquaint the beings on other planets【C20】______life and the level of civilization on our planet.
【C6】
选项 A、being invented
B、invented
C、have now been invented
D、have now invented
答案C
解析 此题为语法类题目。通过上下文可以判断出since 引导的是原因状语从句，所以从句中应有谓语动词。A、B都是分词结构，所以不对。radio telescopes 是被发明，要用被动态，而且时态上有一个完成的关系，故选C。
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