-Four o'clock in the morning?

-What? Oh, no, don't ring me up that early. I ________.[ ]

A．will sleep  

B．will be sleeping

C．am sleeping  

D．am going to sleep

胎儿唾液腺成熟度的检查方法是（）

A.羊水吸光度试验

B.羊水中胆红素的A₄₅₀测定

C.羊水中脂肪细胞百分率检查

D.羊水葡萄糖测定

E.羊水中淀粉酶活性的测定