著名的蛋壳黑陶高柄杯是()时期制作的器物。
参考答案:龙山文化
---- Can you _____ all the money that I should pay now?
-----Very sorry, madam. Wait a minute, please.
A. add up B. add to C add up to D add
人体最早的造血器官是
A.肝脏
B.脾脏
C.卵黄囊
D.骨髓
E.胸腺