专四
A．backs
B．necks
C．toes
D．heels
考查固定搭配。on one’s heels是一个固定搭配，意思是“紧随其后，紧追不舍”。其他各项都没有这种用法。因此，应该选择D。
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根据以下资料，回答题：
Dried foods
Nowadays vegetables are most commonly dried
Alkaline solutions are used to