Why does the author mention Colonel Clark's expedition?
A.To explain how one state strengthened its land claims.
B.To criticize an effort to acquire additional agricultural resources.
C.To show that many explorers searched for new lands.
D.To question the validity of Virginia's claims.
第3题
A.随机抽查
B.定期抽查
C.重点检查
D.全部检查
第4题
A.随机抽查
B.定期抽查
C.重点检查
D.全部检查
第5题
A.5%
B.10%
C.15%
D.20%
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