单项选择题

We spent the day ______ through forests and over mountains.

A．drudging
B．dribbling
C．trekking
D．thumping
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单项选择题
Substances, whether in the solid, liquid, or gaseous state, possess ______ which are independent of the force of cohesion.
A．attributes
B．tendencies
C．elements
D．ingredients
单项选择题
Susan made careful ______ as to the kinds of cake and candy needed for her party.
A．stimulation
B．appreciation
C．identification
D．specification
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