题干

人在15℃环境中和5℃环境中穿的衣服一样多时,体温是恒定的,而且在这两种环境中既不出汗也无寒颤,这时体温的调节主要通过(  )

A:增减产热量

B:调节皮肤血管口径

C:立毛肌收缩或舒张

D:拱肩缩背以保温或伸展肢体以散热

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答案(点此获取答案解析)

B

同类题5

根据短文内容,选择最佳答案。

    There were three big fish in the lake. One of them, Demo, was wise; another one, Jimmy, was half-wise; Martin, the third one, was stupid.

    Some fishermen came to the bank of the lake with their nets. The three fiss saw them.

    Demo decided at once to leave, to make the long and difficult trip to the ocean. He thought, "I won't discuss with these two about this. They love this place so much that they call it home and will stay on. How silly they are! They still haven't realized we are in great danger now. Their ignorance will cost them their lives."

    Seeing the wise fish had left, Jimmy thought, "My guide has gone and now I've lost my chance to escape." He felt sorry for it and then thought, "What can I do to save myself from these men and their nets? Perhaps I should pretend(假装)to be already dead, giving myself totally to the water."  So he did that. He went up and down with the water, helpless, within arm's reach of the fishermen.

    "Look at this! The best and biggest fish is dead." One of the men lifted him by the tail, and threw him up on the ground. He rolled(滚动)over and over and moved secretly toward the water, and then, back in.

    The third fish was aimlessly jumping about, trying to escape with his speed and cleverness. The net, of course, finally closed around him, and as he lay in the hot frying-pan bed, he thought, "If I get out of this, I'll never live again in the limits of the lake. Next time, the ocean! I'll make it my home."