解析：选A。作者态度题。由最后一段．..no matter how old you are，if you’re feeling stressed...a phone call to Mom might be just the key to help you feel better可知，作者支持实验结论。

　　D

　　Like other marsupials(有袋动物)，a koala mother carries her baby in her pocket until it’s large enough to ride on her back.

　　Though often called the koala “bear”，this lovely animal isn’t a bear at all；it’s a marsupial.After giving birth，a female koala carries her baby in her pocket for about six months.When the young comes out，it rides on its mother’s back or hangs on to her belly(肚子)until it’s about a year old.

　　Koalas live in eastern Australia，where the eucalyptus(桉树)trees they love are most plentiful.In fact，they hardly leave these trees，and their sharp “feet” easily keep them in the high place.During the day they sleep sometimes，put them into forks in the trees，sleeping for up to 18 hours.

　　When not asleep，a koala feeds on eucalyptus leaves，especially at night.Koalas do not drink much water and they get most of their wet from these leaves.Each animal eats a large amount for its size—about two and a half pounds of leaves a day.Koalas even store snacks of leaves in pockets.

　　A special digestive(消化的)system allows koalas to break down the hard eucalyptus leaves and remain unharmed.Koalas eat so many of these leaves that they take on a special smell，making you think of cough pills.

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