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发布时间：2006-06-21 20:59     点击：

(B) difficult to detect

(C) the oldest element in the universe

(D) the most prevalent element in quasars

14. The word "constituents" in line 7 is closest in meaning to

(A) relatives

(B) causes

(C)components

(D) targets

15. Why does the author mention "cosmic rays't' in line 7?

(A)As part of a list of things containing helium

(B) As an example of an unsolved astronomical puzzle

(C) To explain how the universe began

(D) To explain the abundance of hydrogen in the universe

16. The word "vary" in line 10 is closest ill meaning to

(A) mean

(B) stretch

(C) change

(D) include

17. The creation of helium within stars

(A) cannot be measured

(B) produces energy

(C) produces hydrogen as a by-product

(D) causes helium to be much more abundant In old stars than In young star:

18. The word "calculated" in line 15 is closest in meaning to

(A) ignored

(B) converted

(C) increased

(D) determined

19. Most of the helium in the universe was formed

(A) in interstellar space

(B) in a very short time

(C) during the first minute of the universe's existence

(D) before most of the hydrogen

20. The word "ceased" in line 26 is closest in meaning to

(A)extended

(B)performed

(C)taken hold

(D)stopped

Questions 21-30

In colonial America, people generally covered their beds with decorative quilts resembling those of the lands from which the quitters had come. Wealthy and socially prominent settlers made quilts of the English type, cut from large lengths of cloth of the same color and texture rather than stitched together from smaller pieces. They mad these until the advent of the Revolutionary War in I 775, when everything English came to be frowned upon.

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