A. tell their children stories instead of reciting(背诵)facts

　　B. offer their children chances to see things for themselves

　　C. be patient enough when their children answer questions

　　D.

　　encourage their children to ask questions of their own

　　

　　C

　　Why does eating feel so good?

　　The secret may lie in the head,

　　not in the stomach,

　　US researchers reported.

　　Tests on rats show that the appetite hormone Ghrelin(释放激素释放肽) acts on pleasure receptors (感受器) in the brain. The findings may help researchers develop better diet drags.

　　“In mice and rats, Ghrelin excites the same neurons (神经细胞) as delicious food, that is, neurons that

　　provide

　　the

　　feeling

　　of

　　pleasure

　　and

　　the expectation of reward,”

　　the researchers write in the Journal of Clinical Investigation. “These neurons are located in a region of the brain known as the ventral tegmental area (VTA)," wrote the researchers, headed by Dr.

　　Tamas Horvath of the Yale University School of Medicine in Connecticut.

　　Horvath's team found that Ghrelin, which is only discovered in the last decade,

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