题目

阅读短文，从每小题所给的四个选项中选出能回答所提问题或完成所给句子的最佳答案。Have you ever heard of water bears? They have lived on the earth for more than 500 million years, long before dinosaurs. Though called bears, they look completely different from bears! The largest ones are only 1. 4 mm long. Each of their eight legs ends with a claw（爪）. They also have sharp mouths! Some of the places they live may surprise you! They live deep down in the ocean. It's too dark to see well, and the weight of water from up above is very heavy. But tiny water b下列关于下丘脑在生命活动调节中的叙述中，不正确的是 （ ）A. 感受细胞外液渗透压的刺激，产生动作电位B. 作为体温调节中枢，调节激素分泌影响产热C. 通过反射弧，直接调节汗腺的分泌影响散热D. 通过分泌激素，间接影响胰高血糖素的分泌