有线电视系统的前端设备不包括（）。A．调制器 B．混合器 C．放大器 D．频道处理器

任务型阅读。阅读下面的短文，并完成短文后的任务。

    Waste can be seen everywhere in the school. Some students ask for more food than they can eat and

others often forget to turn off the lights when they leave the classroom. They say they can afford these

things. But I don't agree with them.

    Waste can bring a lot of problems. Although China is rich in some resources (资源), we are short of

others, for example, fresh water. It is reported that we will have no coal or oil to use in 100 years. So if

we go on wasting our resources, what can we use in the future and where can we move? Think about it.

(1) I think we should say no to the students who waste things every day. Everybody should stop wasting

as soon as possible.

    In our everyday life, we can do many things to prevent (阻止) waste from happening, for example,

turn off the water taps when we finish washing, turn off the lights when we leave the classroom, try not

to order more food than we need, and so on. Little by little, everything will be changed. (2) Waste can be

stopped one day, if we do our best.

任务1：根据要求答题。(请注意问题后的词数要求)

1. List the wastes mentioned in the first passage: (within 15 words)

    _________________________________________________________

2. What problems can waste bring? (within 20 words)

(1) _________________________________________________________

(2) _________________________________________________________

任务2：将短文中划线的句子翻译成汉语。

3. __________________________________________________________

4. __________________________________________________________

任务3：请给短文拟一个适当的标题：(within 5 words)

5. __________________________________________________________

生铁和钢的主要区别是 [ ]

A．生铁含杂质，钢不含杂质

B．生铁含碳，钢不含碳

C．生铁不含碳，钢含碳

D．生铁中含碳2%-4.3%，钢中含碳0.03%-2%

在下列命题中，属于人本主义观点的是

A．凡是存在的都是合理的

B．存在就是被感知

C．世界统一于存在

D．存在先于本质

冷却水质不好，含有大量杂质，易使冷却水管堵塞或腐蚀泵轴，应（）。

A、增大冷却水压

B、增大冷却水量

C、更换水源

D、降低冷却水压

儿童短管骨结核最具特征性的X线表现是（）

A.单纯骨皮质破坏

B.骨质增生硬化

C.骨气鼓

D.死骨及窦道形成

E.以上都不是