单项选择题

Europe’s earlier industrial growth was （）by the availability of key resources, abundant and cheap labor, coal, iron ore, etc.

A．constrained
B．remained
C．sustained
D．detained

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单项选择题
Many countries have adopted systems of （）education in order to promote the average level of education.

A．constrained
B．compulsory
C．cardinal
D．conventional
单项选择题
Mutual respect for territorial （）is one of the bases upon which our two countries develop relationships.

A．reliability
B．unity
C．entirety
D．integrity
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