题目

阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。AGIFTFOR GRANDPASummer vacation wascoming. Jack and his brother Berlin were filled with excitement as they thoughtof visiting their grandparents again.The big day came atlast. After the happy family got ready, they set out for the grandparents'eagerly. On the way, the brothers were excitedly talking about the fun they hadwith grandparents.A little blue housewith a tall white chimney finally appeared. Behind the property was the forestcarrying their good memories with Grandpa. They arr下列关于原核生物的叙述，不正确的是A．部分原核生物虽无线粒体，但能进行有氧呼吸B．蓝藻无叶绿体．但可以进行光合作用C．乳酸菌没有核膜、核仁，但能进行转录和翻D．原核生物的遗传物质是DNA或RNA