骶骨是由几块椎骨组成（）
A.3块
B.4块
C.5块
D.6块
E.4节退化椎骨融合成1块
参考答案：E
情景选择。
1. 当你想问大家“谁饿了？”时，你应说：[ ]
A. Who are hungry?
B. Who is hungry?
C. Are you hungry?
2. 当你想表达“你想吃些什么呢？”时，你应问：[ ]
A. What you like to eat?
B. What would you like to eat?
C. Would you like some food?
The key _____ on the table when I left. [ ]
A. was left
B. will be left
C. is left
D. has been left
