单项选择题

Ice skates manufactured entirely of iron were first sold in the 1800’s（）

A. mainly
B. successfully
C. solely
D. routinely

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单项选择题
One of the important properties of a scientific theory is its ability to（）further research and further thinking about a particular topic.

A. invent
B. stimulate
C. renovate
D. advocate
单项选择题
Sometimes artists find it hard for their works to win popular（）

A. welcome
B. applause
C. appetite
D. appreciation
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