单项选择题

Few people realize that ______.

A．the Old West period wasn’t as long as most people think
B．cowboys contributed to the end of the Old West
C．cowboys played an important part in the Old West
D．the Old West lasted only 19 years

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单项选择题

______ is the real inventor of the barbed wire.

A．Cowboys
B．Alphonso Dobb
C．John Gillinger
D．Children in Texas

单项选择题

What does the woman remind the man about

A．That taste buds aren’t located only on the tongue.
B．That taste buds aren't all the same size.
C．That solutions must be measured and mixed careful.
D．That he shouldn’t swallow the solutions.