Mary in a hospital now? [ ]
A. Is; working
B. Are ; working
C. Do;works
D. Does ; work
答案:A
The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing system for protecting the secret information.
A.web pages
B.modem
C.security
D.network
休克时细胞最早发生的代谢变化是()
A.脂肪和蛋白分解增加
B.糖原合成增加
C.Na+-K+-ATP酶活性降低
D.从优先利用脂肪酸供能转向优先利用葡萄糖供能