单项选择题

Very few people could understand the lecture the professor delivered because its subject was very （）

A．intriguing
B．indefinite
C．obscure
D．dubious

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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
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
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