問題詳情
You may think all stars look alike. By looking closely you might 1 that some seembrighter than others. You may even notice that some appear to be slightly different in color. Thegreat 2 between stars and the earth makes it hard to see all the differences. The most 3difference is brightness. The 4 of the brightness of a star as seen from the earth is known asmagnitude. The magnitude of a star 5 three things. The first is the star’s distance from theearth. Suppose two stars are exactly alike 6 their distance from the earth. The one that iscloser will appear brighter. It will have a greater magnitude. The second thing that affects themagnitude of a star is size. Stars differ greatly in size. There are stars that have a diameter 10 to 100times 7 the sun. The third thing that affects the magnitude of a star is temperature. Thetemperature of a star also 8 its color.
【題組】1.
(A) create
(B) observe
(C) protect
(D) develop
參考答案
答案：B
難度：簡單0.888889
統計：A(0),B(8),C(1),D(0),E(0)