单项选择题

In spite of the wide range of reading material specially designed or ______ for language learning purposes, there is yet no effective and systematic program for the reading skills.

A．appointed
B．'assembled
C．acknowledged
D．adapted
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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
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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