What's Mark Twain's attitude toward the examination in Chapter 21 of The Adventures of Tom Sawyer?
A. The examination only allows mechanic imitation but lacks of innovation.
B. The long sermons students add to the end of their compositions are boring and didactic
C. The topics students choose to make compositions are new and creative
D. The audience present at the examination shows sincere applause to the students' performance especially when they add long sermons to their compositions
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Which of the following is correct statement about Chapter 22 of The Adventures of Tom Sawyer- "Huck Finn Quotes Scripture"?
A. During the summer vacation, the town undergoes a religious “revival”.
B. Tom Sawyer had a lot of fun during the vacation but the fun never lasts long.
C. During a stormy night, Tom Sawyer was very excited.
D. The boys suffered a “relapse" as later they returned to their bad habits again.
At the heart of Mark Twain’s achievement is his creation of two characters: ____and ____.
具有NaCl型结构的矿物有()。
A. 闪锌矿
B. 萤石
C. 黄铜矿
D. 方铅矿
绝大多数的含氧盐、常见的硫化物、氧化物和卤化物均属于（）类型。
A. 金属晶格
B. 离子晶格
C. 原子晶格
D. 分子晶格
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