仅对下丘脑有正反馈作用的是
A.人绒毛膜促性腺激素B.人胎盘生乳素C.雌激素D.孕激素E.前列腺素
参考答案:A
Although she believed that she had a good chance of recovering, the doctors said that few, _____ , could
come back to normal after getting this disease.
[ ]
A. if any
B. if so
C. if not
D. if ever
下列关于惯性的说法中,正确的是
A.火箭升空时速度增大,惯性增大
B.汽车刹车时速度减小,惯性减小
C.宇航员从地球到太空,惯性不变
D.只有静止或匀速运动的物体才有惯性