A:置换单个碱基对
B:增加4个碱基对
C:缺失3个碱基对
D:缺失4个碱基对
Charles Schulz is famous creating the cartoon character, Snoopy.
Zhang Peng is a______and Sarah is a_______.()
十一届三中全会后,经济体制改革在农村推行( )