Which of the following can be inferred from Justine Roberts' words?

A．Most parents' former experience about snacks is practical.

B．It is easy to tell healthy snacks and unhealthy snacks apart.

C．Children only take in lots of sugar from snacks and drinks.

D．Change4Life is meaningful for parents' decisions on snacks.

解析：D　考查推理判断。根据尾段Justine Roberts所说的话“The rule of thumb from Change4Life can help parents make their decision correctly and wisely”可知，来自Change4Life的经验法则能帮助父母正确而明智地作出决定；由此可推知，Change4Life对父母在零食上作出的决定有意义，故D项正确。

4．What is the best title for the text?

A．Solve the Health Problems of Children

B．Change the Eating Habits of Children

C．Limit Children's Intake of Calories

D．Ensure Children's Healthy Lifestyle

解析：C　考查标题判断。通读全文可知，本文主要介绍了英国卫生部门发起的名为Change4Life的活动，以限制儿童的糖摄入量，故C项最适合作文章标题。