题目内容

There is no single method of food ________ that provides protection against all harms for an unlimited period of time.

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The Ethiopian zone in Africa is famous for its great ________ of distinctive animals and birds.

Although he died poor, he left his children a ________ of love and respect.

Einstein’s theory of relativity seemed________ when it was first introduced.

A new study published in the Science journal suggests the increasing amount of carbon dioxide being absorbed by the seas is causing them to turn acidic with ________ speed.