某建设项目的现金流量为常规现金流量，当基准收益率为8%时，净现值为400万元。若基准收益率变为10%，则该项目的NPV（单选）
A. 不确定
B. 等于400万元
C. 小于400万元
D. 大于400万元
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某一制造过程产生了难闻的气体，这些气体可能会威胁公众的健康。用成本-收益分析法，如何确定工人接触致命气体的风险是否可接受？
CONVERSATION 1Listen to a conversation and choose the best answer to each question you hear.[音频]1.
A. Children’s behavior.
B. Children’s problems.
C. Parenting techniques.
Difficulties of parenting.
2.
A. Parents often criticize their children.
B. Parents know how to bring up children.
C. Parents often complain about their children.
D. Parents are quick to complain about things.
3.
A. Not to show too much affection to children.
B. To be friendly with children.
C. To communicate with children regularly.
D. To let children grow in their natural way.
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