试题与答案

Q、R、X、Y、Z为前18号元素中的五种,Q的低价氧化物与X单质分子的电子总数相

题型:填空题

题目:

Q、R、X、Y、Z 为前 18 号元素中的五种,Q 的低价氧化物与 X 单质分子的电子总数相等,R 与 Q 同族,X、Y与Z不同族,Y 和 Z 的阴离子与 Ar 原子的电子结构相同且 Y 的原子序数小于 Z.

(1)Q 的最高价氧化物,其固态俗名叫______;

(2)R 的氢化物分子的空间构型是______,它与 X 形成的化合物可作为一种重要的陶瓷材料,其化学式是______;

(3)X 的常见氢化物的空构型是______;它的另一氢化物 X2H4 是一种火箭燃料的成分,其电子式是______;

(4)Q 分别与 Y、Z 形成的化合物的化学式是______和______;Q和 Y 形成的化合物分子的结构式是______,属于______化合物(填“离子”或“共价”),______分子(填“极性”或“非极性”)

答案:

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参考答案:磁迹宽度和带速

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题型:阅读理解

阅读理解

     Here are some tips (建议) on how to stay safe in earthquakes.

     1. Stay inside and duck and cover. Get under a desk or table, or stand in a corner or under a

doorway. Cover your head and neck with your arms.

     2. Move against a wall if in a high building with no protective desk or table nearby. Cover your head

and neck with your arms.

     3. Try to get into an open area away from trees, buildings, walls, and power lines (电杆) if outdoors.

     4. Pull over (停靠)to the side of the road away from overpasses (天桥) and power lines if driving.

Stay in your car until the shaking ends.

     5. Get away from shelves or other areas where objects may fall if in a crowded store or public area.

Do not run for the door. Lower your body close to the ground and cover your head and neck with your

hands and arms.

     6. Stay in your seat if in a cinema or a theater. Get below the level of the back of the seat and cover

your head and neck with your arms.

     7. If you take cover (躲避) under a strong piece of furniture (家具), hold on to it and be prepared

to move with it.

     8. Try to stay away from kitchens, where there are often many objects that might fall or get burnt.

1. The best title (标题) of the passage is _____.

A. How to protect yourself in an earthquake

B. Covering your head and neck with your arms can protect you in an earthquake

C. Advice for dangerous situations

D. How to stay calm (保持镇静) in an earthquake

2. The underlined word “ duck” in Tip 1 means _____.

A. a water bird with short legs    

B. some kind of meat for eating

C. walk like a duck              

D. lower your head or body very quickly

3. Which is the correct way to act in an earthquake?

A. Run downstairs and cover your head and neck with your arms.

B. Drive your car quickly through the overpass and get out of it.

C. When you stay under a strong piece of furniture, you should hold on to it and be prepared to move

with it.

D. Climb over the back of the seat and cover your head and neck with your arms.

4. _____ should be the most important part(s) to be protected in an earthquake.

A. Your head and arms          

B. Your arms

C. Your neck and arms          

D. Your head and neck

5. Tip 3 and Tip 4 give you some advice(建议) on what you should do when you are _____.

A. inside a building            

B. outside a building

C. in your house              

D. in a store

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