[听力原文]
M: Miss, what time is flight 345 for New York due to depart
W: it leaves at 2:50, but you must check in one hour ahead of departure.

At what time must the passenger arrive at the airport for Flight 345（）

In the advanced course, students must take objective te...

单项选择题In the advanced course, students must take objective tests（）monthly intervals.

The professor required that all the essays（）ready by ne...

单项选择题The professor required that all the essays（）ready by next Monday.

Colorblind people find it difficult to（）shades of color...

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