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阅读理解：
The system has several advantages.Shepherds do not have to walk among the sheep,which tends to disturb the mother sheep that are about to give birth.Instead,they can stay inside,watching by remote control.If there is no problem,they stay away from the sheep.But when they are needed they can quickly go out to help,or to scare away foxes.The experiment is popular 'with shepherds because it means that they do not have to spend all their time outdoors waiting for the lambs to arrive in freezing weather.
From the passage,we learn that walking among the sheep ______.
A.is more popular with shepherds than watching TV inside
B.can help the mother sheep to give birth to more lambs
C.is the best way to protect the sheep
D.usually disturbs the mother sheep that will give birth
正确答案：D
答案解析：根据本段第二句话Shepherds do not have to walk among the sheep,which tends to disturb the mother sheep that are about to give birth.可知D项正确。
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