儿童最常见的颈髓肿瘤是()
A.髓母细胞瘤
B.少突胶质细胞瘤
C.星形细胞瘤
D.生殖细胞瘤
E.畸胎瘤
参考答案:C
You should lie down and ________ a rest. [ ]
A. have
B. has
C. to have
D. having
按照我国儿童免疫程序,儿童在出生时规定接种的疫苗为
A.卡介苗B.乙肝疫苗第1针C.卡介苗和乙肝疫苗第1针D.脊灰疫苗E.百白破疫苗