Man can hardly understand why many animals live their whole life in the desert, as

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water is an essential part of his existence

very few large animals are found in the desert

sources of flowing water are rare in a desert

water composes the greater part of the tissues of living things

Giải thích

Đáp án A

Thông tin: Since water is the basis of life […]And since man’s inexorable necessity is to absorb large quantities of water at frequent intervals, he can scarcely comprehend that many creatures of the desert pass their entire lives without a single drop.