据统计，争取一个新客户的成本是留住一个老客户的（）倍。
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这篇文章的目的是什么？
A. 介绍会议内容
B. 研究雨林消失的原因
C. 号召人类保护热带雨林
D. 《国际热带木材协定》的内容
The main thing that all bonds have in common is that they______.
A. denote borrowing by whomever issued them
B. have less than twenty years maturity
C. include a coupon payment
D. are issued by corporations
A．spellB．telephoneC．sheD．very
A. spell
B. telephone
C. she
D. very
Which of the following is the main (主要的) idea？
A. The girl can't explain (解释) anything clear to others.
B. The old man wanted to post a letter and he misunderstood (误解) the girl.
C. Posting a letter was difficult.
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