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？

A. Children’s behavior.
B. Children’s problems.
C. Parenting techniques.
Difficulties of parenting.

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.

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.

A. Parents shouldn’t allow children to surf the net.
B. Parents shouldn’t allow children to use smartphones.
C. Parents should encourage children to learn the digital things.
D. Parents should monitor how often children use the Internet.