高一英語下冊Unit2單元復習教案1
so next time you stare up at the night sky，remember：there’s more in the sky than we can see！scattered in the silent darkness are black holes－the great mystery of space.
【解題導語】 每當你抬頭仰望天空中閃爍的群星時，你是否知道在廣袤的太空中還隱藏著無數我們無法看到的東西——黑洞。本文向讀者介紹了這些黑洞的形成原因和過程。
5. according to the article，what causes a star to die?
a. as its gases run out，it cools down.
b. it has a collision with other stars.
c. it can only live for about a million years.
d. as it gets hotter and hotter，it explodes.
解析：選a。細節理解題。文章第六段講述了其原因。當恒星周圍的氣體燒盡時，它便停止燃燒然后死亡。
6. which of the following statements is not true?
a. black holes are dead stars.
b. black holes have gravity.
c. black holes are invisible.
d. there is nothing as mysterious as a black hole.
解析：選d。細節理解題。文章只提到黑洞是宇宙中神秘的天體，但并沒有說它是最神秘的東西。
7. what happens after a star dies?
a. it becomes invisible.
b. it falls to the earth.
c. it burns up all of its gases.
d. it becomes brighter and easier to see.
解析：選a。推理判斷題。從第七、八段的內容可知a項正確。8. why can’t you see light when you look at a black hole?
a. because most black holes are so far away.
b. because the gravity of a black hole is so strong that it sucks the light inward.
c. because as the star’s gases burn，it stops giving off heat and light.
d. because as a star cools，its outer layers pull in toward its center.
解析：選b。細節理解題。根據文章倒數第二段中的“a black hole is so tightly packed that its gravity sucks in everything－even light. the light from a black hole can never come back to your eyes. ”(黑洞的密度如此之大，以至于其重力能吸引一切——甚至于來自黑洞的光永遠無法到達你的眼睛)可知答案。