松果体区最常见的肿瘤是()
A.松果体细胞瘤
B.松果体母细胞瘤
C.生殖细胞瘤
D.畸胎瘤(包括恶性畸胎瘤)
E.内胚窦肿瘤
参考答案:C
解析:松果体区的肿瘤50%以上为生殖细胞瘤。
神经、肌肉、腺体受阈刺激产生反应的共同表现是()
A.收缩
B.分泌
C.局部电位
D.阈电位
E.动作电位
---Is your father at home?
----No, he ________the USA.
A. has been to B. has been in
C. has gone to D. went to