1. What is the main topic of this passage?
(A) the nature of radar
(B) types of ranging
(C) alternatives to radar
(D) history of radar
2. In line 2, the word "dense" could be replaced by
(A) cold
(B) wet
(C) dark
(D) thick
3. According to the passage, what can radar detect besides location of objects?
(A) size
(B) weight
(C) speed
(D) shape
4. The word "shouts" in line 8 is most similar in meaning to which of the following?
(A) eavesdrops
(B) yells
(C) confesses
(D) whispers
5. Which of the following words best describes the tone of this passage?
(A) argumentative
(B) imaginative
(C) explanatory
(D) humorous
6. The phrase "a burst" in line 13 is closest in meaning in which of the following?
(A) an attachment
(B) a discharge
(C) a stream
(D) a ray
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