某气体单质和氧气的相对分子质量之比为7:8,该气体可能是:[ ]
A.CO
B.CO2
C.Cl2
D.N2
答案:D
根据首字母提示,补全单词。
1. Lily has three m apples than my pen pal, Tom.
2. Mike's f are smaller.
3. Zhang Liang is 15. He is one year o than Liu Yun.
4. —What's y favorite food?
—Noodles.
5. —H large is your room?
—My room is smaller than Tom's.
抗O>800U
A.感染性心内膜炎B.急性病毒性心肌炎C.急性风湿热D.红斑狼疮E.肥厚型心肌病