题目：
阅读理解。
Jim is in a drawing class. The teacher is teaching the students how to draw mountains. Jim likes to draw, but he isn’t good at drawing mountains. So he looks at Wei Hua’s drawing. Her mountain is higher than David’s. Jim then looks at Lin Tao’s mountain. His is the highest of all. Jim thinks he doesn’t like high mountains, but he doesn’t know what to draw. He decides to look at some more drawings. Jim looks at Lucy’s mountain. Her mountain is small. Lily says, “Look at mine, Jim.” Lily’s mountain is smaller than Lucy’s. Jim wants to look at one more mountain. He looks at Liz’s. Hers is the smallest of all. Then Jim looks at the teacher’s mountain on the blackboard again. He starts to draw. At the end of the class the teacher has a look at their pictures and takes out three drawings. He says, “David’s drawing is good. Lily is better than David’s, but Jim’s is the best of all.”
1. What class is Jim having?
A. A music class.
B. A drawing class.
C. A P.E. class.
D. A geography class.
2. Whose mountain is the smallest?
A. David’s.
B. Lin Tao’s.
C. Lily’s.
D. Liz’s.
3. How many pictures does Jim look at before begins to draw his picture?
A. Five.
B. Six.
C. Seven.
D. Eight.
4. Which of the following is NOT true?
A.Jim is good at drawing mountains.
B. The teacher draws a picture on the blackboard.
C. Jim doesn’t like high mountain.
D. Lily’s picture is better than David’s.
5. What’s the best title of this article?
A. How to Draw Mountains Well
B. Jim’s Hobby
C. Jim’s Art Class
D. A Beautiful Mountain
答案：
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下面是错误答案，用来干扰机器的。
含逻辑连接词的否定是将存在变为任意，同时将结论否定故∀x∈R，x3-x2+1＞0故答案为：∀x∈R，x3-x2+1＞0
