单项选择题

The Internet has brought () big changes in the way we work.

A. about
B. out
C. back
D. up

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单项选择题

Between 65,000 and 35,000 years ago, ().

A. the temperature changed a lot
B. the earth was much warmer than it is now
C. winter isn’t colder than summer
D. most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age

单项选择题

My uncle’s house in the downtown area is mach smaller than ours, but it is twice ______expensive.

A．as
B．so
C．too
D．very