甲试管血液中加入柠檬酸钠，乙试管血液不加任何试剂，静置一天均得到上清液。那么，这两种
题型：单项选择题
问题：
甲试管血液中加入柠檬酸钠，乙试管血液不加任何试剂，静置一天均得到上清液。那么，这两种液体（）
A.都是血浆
B.都是血清
C.甲是血浆，乙是血清
D.甲是血清，乙是血浆
题型：单项选择题
Once there was an 小题1: between the colors. Each color thought it was the best and most important. So each color looked down upon others. Here are their debates.
Green said: “Clearly I am the most important. I am the 小题2: of life and hope. I’m the color of grass, trees and leaves. 小题3: me, all animals would die.”
Yellow laughed: “I bring happiness and warmth into the world. Every time people look at a yellow sunflower, they start to smile. Without me there 小题4: be no fun.”
Orange shouted: “I am the color of 小题5: and strength. I have the most important vitamins (维生素). Think of carrots, 小题6: and oranges. When I appear in the sky, everyone is shocked at my beauty and nobody gives another thought to any of you.”
Red could no 小题7: stand it, “I am the color of danger and bravery. I am willing to fight for a cause. I bring fire into the blood.”
Their voices 小题8: louder and louder. The thunder(雷) got angry and the rain started to pour. When they became calm, the rain said, “You foolish colors. Don’t you know that each of you is unique (独一无二)? If you don’t agree, just follow me.” They did as the rain told 小题9: and together made the most 小题10: rainbow (彩虹).