2017托福100篇阅读理解试题（十一）_第4页

　　6. According to the passage , which color appears most frequently in an aurora display?

　　(A) greenish-white

　　(B) crimson

　　(C) blue

　　(D) violet

　　7. The word "emit" in line 20 is closest in meaning to

　　(A) change from

　　(B) connect with

　　(C) add to

　　(D) give off

　　8. The word "glowing" in line 22 is closest in meaning to

　　(A) shining

　　(B) moving

　　(C) charging

　　(D) hanging

　　9. Auroras may be seen in the southern regions of the United Sates when

　　(A) magnetic storms do not affect Earth

　　(B) solar flares are very intense

　　(C) the speed of the solar wind is reduced

　　(D) the excitation of atoms is low

　　10. The passage supports which of the following statements about scientists' understanding of auroras?

　　(A) Before advances in technology, including satellites, scientists knew little about auroras.

　　(B) New knowledge about the fusion of atoms allowed scientists to learn more about auroras.

　　(C) Scientists cannot explain the cause of the different colors in auroras.

　　(D) Until scientists learn more about plasma physics, little knowledge about auroras will be available.

　　11. Which of the following terms is defined in the passage ?

　　(A) "magnetosphere" (line 6)

　　(B) "electrons" (line 15)

　　(C) "ionize" (line 15)

　　(D) "fusion" (line 29)

　　参考答案：BCBBC ADABA A