单项选择题

In what way does the speaker think diving is similar to space travel（）

A．They both attract scientists attention.
B．They can both be quite challenging.
C．They are both thought-provoking.
D．They may both lead to surprising findings.

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单项选择题
What is one of the reasons for the speaker to switch his interest to underwater exploration（）

A．It is more exciting than space e travel.
B．It is much cheaper than space travel.
C．It is much safer than space travel.
D．It is less time-consuming than space travel.
单项选择题
What do people usually say about middle children（）

A．They grow up to be funny and charming.
B．They often have a poor sense of direction.
C．They get less attention from their parents.
D．They tend to be smart and strong-willed.
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