Why are very hot stars referred to as «ghosts»?

A) They are short-lived
B) They are mysterious
C) They are frightening
D) They are nearly invisible 218. (v17-106-35) In the passage, the phrase «giant patriarchs» could best be replaced by which of the following? A) tiny seeds B) important leaders C) towering trees D) Egyptian pyramids 219. (v17-106-36) The author implies that, compared with sequoias, other trees have A) been in existence longer B) adapted more readily to their environments C) been affected more by animals D) had a closer relationship with people 220. (V17-108-29) Read the text. Then choose the correct answer for each question below (29-32). A proud young, man was looking for a new pastime. He heard about people hiking in the national parks and decided to try it for himself. As he started his stroll, an old man walked up to him. «Dont go this way», the old man said. «Beware. The paths are not clear. Its easy to become lost.» But the young man disagreed with the old man and bragged that he had a perfect understanding of the park. «I studied maps of this area», he told him. «I believe I have a thorough knowledge of these trails. I wont become lost.» The old man listened to the young man and then admonished him for his pride. «I have walked these trails my entire life», he said. «If you think you will be safe, then go ahead.» The young man ignored the old man and started along the trail. Whenever he had to choose between an easy or difficult route, he always chose the more difficult option. In addition, he was not conscious of which direction he was going. After a while, he decided to return home. Because his course through the wilderness was so indirect, he had no idea where he was. He looked at his map but could not pinpoint his location. He walked one path after another but soon realized he was lost. The sun was going down, and sudden strong winds gave a hint that it might rain. Immense clouds filled the sky. Awesome sounds of thunder were audible from all directions. It echoed off the mountains. The thought of the eventual storm tormented the young man. He hurried in one direction, but soon switched out of confusion. Luckily, it led him out of the park. When he arrived home, he knew that he had acted like an idiot. He realized he was lucky to be alive. He decided to listen to people with more experience than himself. What did the young man choose as his new pastime? A) Picking trails B) Climbing mountains C) Talking with old men D) Hiking in parks 221. (v17-108-30) Why did the old man admonish the young man? A) The young man was awesome B) The young man bragged that he was perfect