单项选择题：填隙碎石适用于（）。 A.各级公路的底基层 B.二级公路基层 C.二、三、四级公路基

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Chinese parents are being urged to pay more attention to their children's nutrition, after a study

revealed that unscientific ways of feeding babies and a lack of trace elements are the two biggest threats

to youngsters'health. Experts drew these conclusions from a two year study into the nutrition and health

situation of children under six in ten cities including Beijing, Shanghai and Guangzhou.

Started in 2003 by the China National Children's Center, the survey includes 8043 children, equally

divided between the sexes. It shows 37 percent of surveyed children have baby food earlier than the

recommended age of four to six months old, with another 35percent taking it later, which in return brings

about a nutrition difference as these children grow up. "Our children above four to six months old fall

behind foreign children in terms of their physical well?being," said Zhao Shunyi, head of the center. She

called on Chinese parents to pay more attention to their children's nutrition after they stop breast feeding

at six months old.

Trace elements

The survey also shows more than half of the children above six months old are deficient in five trace

elements which are crucial to their physical development-magnesium, copper, calcium, iron and zinc.

"Lack of zinc will lead to low level of intelligence," said Dou Xiaowei, vice director of the National Center

for Child Nutrition Quality Supervision and Testing. "Parents had better choose baby food with plentiful

trace elements, especially calcium, iron and zinc."

Zhao said, "The center is urging the government to strengthen child food production management by

revising related laws. Child food producers should be advised to market products with rich trace

elements."

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填隙碎石适用于（）。 A.各级公路的底基层 B.二级公路基层 C.二、三、四级公路基