单项选择题

The discovery of the gold in the west ______ the exploration and settlement of California.

A．kept track of
B．shied away from
C．gave birth to
D．came up with

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单项选择题

There have been some changes in gender roles over the years. In the past, it was usually the men who ______ dates and paid all the expense. But now women may do the same, too.

A．initiated
B．boosted
C．evoked
D．undertook

单项选择题

There is fierce ______ between the two companies to get the lion's share in the market.

A．plight
B．gravity
C．rivalry
D．rating

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