吸收性明胶海绵颗粒在髂内动脉栓塞后多少周可以被吸收（）
A.3～4周
B.2～3周
C.1～2周
D.4～5周
E.3～6周
参考答案：B
用所给单词的正确形式完成句子。
1. It's my _____ (one) time to come to China. I like it very much.
2. These _____ (play) do very well in the match. They are really great.
3. Thank you for_____ (organize) the class trip to Nanjing.
4. June 1st is _____ (child) Day.
5. I _____ (1ike) basketball because I am not very tall. It's hard for me.
燃气按来源分类，可分为( )。
A．天然气
B．高热值燃气
C．人工煤气
D．液化石油气
E．生物气
