儿童时期会厌呈哪种形状:()
A.S型
B.A型
C.Q型
D.V型
E.L型
参考答案:C
She was complaining that the doctor was________too much for the treatment he was giving her.[ ]
A.spending
B.offering
C.costing
D.charging
EcoRⅠ是从()中分离鉴定出来的
A、大肠杆菌
B、凝乳酶
C、乳酸菌
D、面包酵母菌