阅读下面短文，掌握其大意，从每小题所给的A、B、C三个选项中选出最佳选项。

    One day Eric was traveling on horseback. At noon, he tied his horse to a 1. Afew minutes later, Paul came along and tied his horse to the same tree.

   “My horse is wild,” said Eric. “Please tie your horse to another tree, 2 my horse will kill yours.”

   “No way!” Paul said, “I shall tie my horse as I like!”He tied up his horse and had his 3 nearby. After a moment they heard a terrible noise. The two horses were 4. They ran up to them, but it was too 5. Paul's horse was killed. “See what your horse has done! You'll have to 6 it,”shouted Paul. And he brought Eric before Mr. Know.

    Mr. Know asked Eric some questions. But Eric said 7. At last Mr. Know said, “This man cannot speak.”

  “He can!” Paul said 8. “He talked to me when I met him.”

  “Are you 9?”asked Mr. Know. “What did he say?”

  “He told me not to tie my horse to the same tree because his horse was wild and would kill my horse.”

  “Oh,” said Mr. Know. “So he 10 you. Then can you expect to get money from him?” Paul had to leave silently.

已知f（x）=x²﹣3，g（x）=me^x，若方程f（x）=g（x）有三个不同的实根，则m的取值范围是（　　）

以下是实验室常用的部分仪器．

在氧气中燃烧，产生明亮的蓝紫色火焰，且有刺激性气体产生的是（    ）