轴承内圈或外圈的互换属于（）。
A. 完全互换
B. 不完全互换
在策划旅游项目的时候，应该选择吸引力（）、影响范围（）的资源为核心进行策划。
David is ______ to have met Jenny again.
A. surprised
B. excited
C. pleased
What does Jenny want David to do?
A. To study business with her.
B. To study English with her.
C. To recommend her a Business English teacher.
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