| Cells cannot remain alive outside
certain limits of temperature, and much narrower limits mark the boundaries of
effective functioning. Enzyme systems of mammals and birds are most efficient
only within a narrow {{U}} (31) {{/U}}around 37℃; a {{U}} (32)
{{/U}} , of a few degrees from this value seriously impairs their
functioning. Even though cells can survive wider {{U}} (33) {{/U}} , the
integrated actions of bodily systems are impaired. Other animals have a wider
tolerance {{U}} (34) {{/U}} changes of bodily temperature. For centuries {{U}} (35) {{/U}} has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of {{U}} (36) {{/U}} the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division {{U}} (37) {{/U}} " wa A. scope B. range C. scale D. field 我来回答: 提交
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