D) a stable
7.All living organisms, regardless of their unique identity, have certain logical, chemical, and physical characteristics in common.
A) as a result of
B) considering
C) on purpose
D) whatever
8.The most crucial problem any economic system faces is how to use its scarce resources.
A) puzzling
B) difficult
C) terrifying
D) urgent
9.Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.
A) sufficiently
B) noticeably
C) intentionally
D) absolutely
10.The Constitutions vague nature has given it the flexibility to be adapted when circumstances change.
A) imprecise
B) concise
C) unpolished
D) elementary
11.The expedition reached the summit at 10:30 that morning.
A) top of the mountain
B) bottom of that morning
C) starting point
D) site
12.The latest census is encouraging.
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