問題詳情

21-25 為題組    People all over the world have become more and more aware that we must takebetter care of the world in which we live. For a long time we have been too wasteful ofour natural resources, 21 that there will be enough land, water, and clean air forever.In these decades, 22 , we have gradually realized that we must be very careful to23 what we have so that we may have enough natural resources for our basic needsin the future. Governments have created laws to protect natural resources from too muchwaste. Natural resources can be 24 seven categories: wildlife, air, minerals, water,forests, soil, and living space. Each of these is 25 our well-being and happiness.Governments all over the world have become very interested in preserving these naturalresources.
21.
(A) thinking
(B) think
(C) thought
(D) to think

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