单项选择题

Readers are invited to _________ their opinions on any of the issues discussed here.

A．dedicate
B．contribute
C．attribute
D．distribute
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单项选择题
This research conducted by these six scientists is in _________ with Yale University.
A．conjunction
B．connection
C．collaboration
D．combination
单项选择题
In classifying the aim is to sort objects by their selected properties into _________ categories.
A．anonymous
B．instantaneous
C．spontaneous
D．homogeneous
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