下列行为属于侵犯公民人格尊严的有（    ）

①海鲜店老板以保证食品卫生为由要求员工小强必须将头发剃光

②商场保安怀疑小丽偷拿了化妆品，强行对她进行了全身搜查

③小张到银行取款，工作人员要求他站在一米线外排队等候

④小明同学在班上乐于助人，主动值日，同学们称他“活雷锋”

下列关于细胞知识或实验方法的叙述，正确的是（    ）

A

    Look! This is a picture of my teacher's family. This is Mr. Smith.  He  is my English  teacher. His wife is a doctor. She is nice. They have a son and a daughter. The boy's  name is Sam and the   girl's name is Kate. They are students. They are in the same school. They go to school on their bikes. Look! The son is like his mother. The daughter is like her father. Now they are all in China and can speak Chinese. They love China.

公元前202年，刘邦击败项羽一统“天下”，称帝建立汉朝，遵循周朝宗法制的原则，他应立下面哪个孩子为太子，作为帝位的法定继承人？(      )