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
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单项选择题
The degree of downward slope of a beach depends on its composition of deposits as well as on the action of waves across its surface.
A．sentiment
B．sediment
C．semester
D．segment
单项选择题
When in his rebellious years, that is when he was sixteen or eighteen, Frank Anderson ______ going around with a strange set of people and staying out very late.
A．took to
B．took up
C．took on
D．took in
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