阅读理解
    Tom lives in the UK. His friend Jack is in Dubai. He will go to see his friend. First he needs to go to London to take the plane.
    On Friday morning, Tom takes a bus to the train station. It takes Tom about 30 minutes to get there. Tom gets on the train at about 10 o'clock：The train leaves at 10：15. The train trip to London takes three hours. At lunchtime Tom gets to London. Tom eats a hamburger for lunch. Then he goes to the airport(机场)by subway. After about one hour,Tom gets to the airport. Tom gets on the plane at 8 o'clock in the evening. The trip takes a long time. Tom is tired(疲倦的)after a busy day. So he goes to sleep(睡觉). On Saturday morning, Tom gets to Dubai. He is very happy, because he will have a great time with his friend.

（1）从细胞元素构成的角度，请简要概括生物与无机自然界的统一性和差异性____

（2）线粒体和叶绿体各存在于什么细胞中？请各用一句话概述____，中心体存在于什么细胞中？____有没有一种细胞同时含有上述三种细胞器？____

（3）请简述主动运输的意义____ 

（4）斐林试剂与双缩脲试剂都由NaOH和CuSO₄组成，简述两者存在哪几个方面的不同？　____ ____ 

—Mr. Smith, I wonder if I could take Friday off?
— ______? It’s a bit difficult with so many people away on holiday, you know.

下列语句中依次填入关联词语最恰当的一项是（　　 ）

创作者要有天马行空的狂气和雄风，_______在创作思想上，______在艺术风格上，_______必须很有点邪劲儿。

下列方程是一元一次方程的是 (     )