单项选择题

In what kind of areas do researchers find high caffeine levels？（）

A.Areas near wastewater treatment plant.
B.Areas that are densely populated.
C.Areas where rivers enter the ocean.
D.Areas far from large population center.

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单项选择题

For most nonimmigrant visa appliers，which of the following is NOT a must before getting a visa issued？（）

A.Making an appointment.
B.Showing up for an interview.
C.Having fingerprints scanned.
D.Bringing previous visa records.

单项选择题

The fighting between army groups and rebels in Congo（）

A.made the cities in the country become very fragile.
B.caused many people to flee away from home.
C.mainly took place in the hilly regions.
D.was due to army troops’offensive acts.