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    In 1620, about half the USA was covered by forests. Today the forests have almost gone. A lot of good land has gone with them, leaving only sand. China doesn't want to copy the USA's example. We're planting more and more trees. We've built the " Great Green Wall" of trees across northern part of our country. The Great Green Wall is 7,000 kilometres long, and between 400 and 1,700 kilometres wide. It will stop the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland in the south. More "Great Green Walls" are needed. Trees must be grown all over the world. Great Green Walls will make the world better.
根据短文内容，选择正确答案。

下列词语中加线的字，每对的读音都不相同的一项是（     ）

某科研人员对玉米组织、小白鼠组织、T₂噬菌体（一种病毒，含有蛋白质和另外一种物质）、乳酸菌等样品进行化学成分分析，结果忘记了贴标签，请你帮他判断：

（1）含有水、DNA、RNA、糖原和蛋白质等成分的生物是____ 

（2）含有染色体的生物是____ 、____ ．

（3）含有水、DNA、RNA、蛋白质和细胞壁等成分或结构的生物是____ 、____ ．

（4）没有细胞结构的生物是____ ；没有成形的细胞核的生物是____ ，它属于____ 生物．

（5）含有水、DNA、RNA、纤维素和蛋白质等成分的生物是____ ．

（6）从上述分析可以看出，生物中都含有____ 和____ 两种成分．

学习生物学知识时，如果用流程图将连续发生的一系列生理活动联系起来，便于我们梳理和掌握．下面的流程图错误的是（　　）