试题与答案

下列甲乙关系说法正确的是 选项甲乙A化石燃料煤气B常用溶剂水C金属材料玻璃钢D大

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题型：选择题

题目：

下列甲乙关系说法正确的是                      

选项甲乙
A化石燃料煤气
B常用溶剂水
C金属材料玻璃钢
D大气污染物二氧化碳

答案：

答案：B

A、三大化石燃料：石油、煤、天然气，煤气不是化石燃料；故错．

B、常用溶剂是水；故对

C、玻璃钢既有玻璃般的透明性或半透明性，又有钢铁般的高强度，属于复合材料；故错．

D、大气污染物包括有害气体和粉尘，二氧化硫、二氧化氮、一氧化碳、粉尘是大气污染物，二氧化碳不是空气污染物；故错．

故选B

考点：金属的物理性质和用途一氧化碳还原氧化铜金属的化学性质金属的回收利用
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题型：阅读理解

Many animals hide(躲藏) to stay alive. They hide in many ways. Some animals hide in leaves; some animals hide in snow. Usually their colors or shapes(形状) help protect them. It’s hard to see an Arctic bear in snow. Its white fur helps protect it. Chameleons(变色龙) can hide by changing colors. Their skin turns the same color as what is around them. Some chameleons can change colors in five minutes.

Many animals try to look bigger than they are to stay alive. Some animals can make other animals think they are very big. If they look very big, animals that are looking for food will run away. Bears can walk on two legs. They look very, very scary(可怕的). Some animals will run away from them.

Many animals try to stay around other animals. This helps them stay alive. Zebras stay close together so that they can help each other look out of danger. Seeing many stripes(条纹) at once can also confuse(使混乱) animals that want to eat them. Some birds stay in a circle, each toward a different direction. In this way they can also help each other stay alive by looking around for animals that may want to eat one of them.

小题1:Animals have ways to stay alive. Which animal try to look bigger than they are to stay alive in the passage?

A．Zebras.

B．Chameleons.

C．Birds.

D．Bears.小题2:Why do animals hide?

A．Because they like to play hide-and-seek.

B．Because they are shy.

C．Because they want to catch other.

D．Because they want to protect themselves.小题3:How do Chameleons hide?

A．They change colors.

B．They change shapes.

C．They hide in snow.

D．They hide in leaves.小题4:How do zebras hide?

A．Become good friends.

B．Talk to each other.

C．Help each other look out for danger.

D．Eat and play together.小题5:Why do animals try to look bigger than they are?

A．They want other animals to run away from them.

B．They want other animals to follow them.

C．They want other animals to see them.

D．They want other animals to like them.
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