吃食物过咸时,就会产生渴的感觉,产生渴觉的感受器和神经中枢( )
A:下丘脑和上丘脑
B:下丘脑和大脑皮层
C:大脑皮层和下丘脑
D:上丘脑和下丘脑
他对社会主义建设作出了卓越贡献,被誉为“两弹元勋”。____
人类与自然的关系是( )
—I've been working on a research report, which was ________ easy. Which of the following can't be put in the blank?