题目内容
More often, the air in Hangzhou is dirty because of _____.
A.corn B.pollution C.medicine D.temperature
B
【解析】
试题分析：句意：因为污染，杭州的空气质量更经常地变差。because of因为，后跟名词，动名词，A.corn玉米 B.pollution 污染 C.medicine 药 D.temperature气温，空气因为污染变脏，故选B。
考点：考查名词的含义。
用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）.
deep watch or school other something accident few happen from |
School is where we learn, make friends and grow up. But ____1.___ happen daily in schools across the world. We hear reports of students falling down ____2.___ buildings while cleaning windows. Other students are hit by football on the playground. Three years ago, some students fell down on the stairs and were stepped on by __3.____, with tragic results.
We feel ____4.___ sorry for the loss of lives. There is ___5.____ we can do to bring the students back, but we can try to prevent (防止) such things from ____6.____ again. You should do the following things to prevent a stampede (踩踏)。
After class or school, don’t rush out at the same time. Wait until there are ___7.____ people trying to leave.
When you walk with a crowd of people, stay alert (警惕的) and ____8.____ your steps. Don’t play around.
Be familiar with your ___9.__ and learn where the safety exits are.
When there’s pushing and squeezing (挤)， don’t move and try to hold on to something. ___10.__ stay in a corner until the crowd leaves.