①T₂噬菌体、肺炎双球菌、烟草都含有DNA

②抑制细胞膜载体活性及线粒体功能的因素，都会影响协助扩散

③蓝藻细胞中含有藻蓝素和叶绿素，所以也能进行光合作用

④蛙的成熟红细胞常被选为获取纯净细胞膜的材料

⑤与动物细胞有丝分裂有关的细胞器只有中心体．

B

    I have a twin brother, Bob. He is taller than me. His hair is shorter than mine. Many people think we must have many things in common. But in fact this is not true. Bob is more outgoing than me. When my parents' friends come to our house, Bob often sits there and talks to them. But I often sit there and say nothing. Bob likes reading, cooking and drawing. I just like swimming and playing basketball. He has more hobbies than me, but he is not as athletic(擅长运动的) as me. Because Bob does better than me at school, my mom often says to me, “Bob is younger than you, but he can get better grades, you should learn from him.” We both like eating fast food and listening to music.

下列判断正确的是

若要研究中国古代的民族关系，应选取下列文物中的(    )

①“单于和亲”瓦当

②“开元通宝”钱

③锦衣卫印

④清廷赐的掣签金瓶