問題詳情

克漏字： Single-cell organisms 21 deep in the earth, more than 9,000 feet below the surface. But until now, it was thought that the temperature, energy, oxygen and space constraints of the subsurface biosphere were too extreme for multicellular organisms. Now, Tullis Onstott, a geoscientist at Princeton University, and colleagues from Belgium, South Africa and the Netherlands report their discovery of a small multicellular worm that dwells at these depths. The worm, known as Halicephalobus mephisto, is tiny — 22 an inch at the longest — and belongs to the vast and diverse phylum of nematodes. The worm appears to tolerate temperatures exceeding 100 degrees Fahrenheit and 23 subsurface bacteria. The researchers studied soil and water samples from the mines to determine that 24 are uniquely subsurface organisms. The samples indicated that while the nematodes live in the deep fracture water of the mines, they do not inhabit the surface-level mining water. The researchers say their findings should be considered as scientists search for life in other extreme conditions — like 25 on Mars and other planets in the solar system. ---adapted from The New York Times---
（ ）
(A) have known to living
(B) known to live
(C) are knowing to life
(D) have been known to live

參考答案

答案：D
難度：簡單0.75
統計：A(1),B(0),C(0),D(3),E(0)

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