单项选择题

According to Ashley Toft, managing director of Explore, what is changing now with regard to travels ？（）

A．The role of travel agents.
B．The way people travel.
C．The number of last-minute bookings.
D．The prices of polar expeditions.

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填空题
The author’s second warning is that we should avoid running a greater risk by （）.
单项选择题
Harvard, Yale, and Princeton show almost no gap between black and white graduation rates mainly because （）.

A．their students work harder
B．they recruit the best students
C．their classes are generally smaller
D．they give students more attention
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