23. If we ________ now to protect the environment, we‘ll live to regret it.

63.我们从未怀疑你对此事件所作解释的真实性。

Section BDirections: This section is to test your ability to understand short conversation.There are 2 recorded conversations in it.After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times.When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.Conversation 16.

（ ）12. The company was set up 15 years ago.

18. Most colleges now offer first-year students a course specially ______ to help them succeed academically and personally.

27. If you ________ home without a word, your parents wouldn‘t be so worried now.

Section BDirections: This section is to test your ability to understand short conversation.There are 2 recorded conversations in it.After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times.When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.Conversation 16.

What does the man mean?

（ ）13. Glasses help people to remedy their eyes.

31. When the sports hero ______ at our party, he was welcomed with open arms.

50. act as a hostess; the only executive assistant entrusted with client greeting, tour leading, and______.

26. —Do you know our school at all?—No, this is the first time I ________ here.