独特型抗原决定簇的氨基酸差异主要在
A、恒定区
B、绞链区
C、可变区
D、超变区
E、补体结合区
参考答案:D
Read and choose.
( )1. What's the matter?
( )2. How tall are you?
( )3. How heavy is your sister?
( )4. How do you get to the zoo?
( )5. Who is taller?
A. She's 50 kg.
B. 170 cm.
C. My brother is taller than me.
D. I have a fever.
E. By car.
连云港市区人均GDP2008年达到37308元,即首次突破5000美元,达到()美元,标志着连云港发展已经上升到一个新的历史阶段。
A、5015
B、5454
C、5500
D、5650