班集体形成的条件和前进的动力是______。

单项选择题—Would you like to play basketball with us —Yes, I'd love to. ______ I'm afraid I have no time.

单项选择题Which of the following is the best title for the passage（）。

A. A Skeleton Key
B. A Man of Many Secrets
C. World-wild Fame
D. Great Escape

单项选择题It can be inferred from the passage that Houdini became famous （）.

A. in 1894
B. before he married
C. at the age of 17
D. when he was about 24

单项选择题In the fourth paragraph, the underlined word this refers to （）.

A. his first prison escape
B. the year 1898
C. the publicity
D. Harry Houdini’s success

单项选择题According to the passage, Houdini’s success in prison escapes depends on （）。

A. his special tricks and supernatural powers
B. his unusual ability and a skeleton key
C. his magic tricks and unhuman powers
D. his wisdom and magic tricks