①矿物质的吸收 ②有机物的合成和运输③细胞的分裂与生长④植物体内水分的散失．

    A meteorite（陨石）almost____(hit) an 80-year-old man named Arthur Pettifer in the UK while he____(work) on the farm. The meteorite was____(big) in the past 26 years in the UK. It weighed（重）one kilo, and might be over 4,000,000,000years old.

    "I heard the big noise in the air. I looked up and saw something falling from the sky to the ground（地面）____ (heavy)," he said, "I had a bad____(feel) about it at that time.____ first I thought it was a plane."

    Meteorites are small things from the space.____ about 3,500 meteorites may fall on the earth every year, only very few of these____(fall) rocks are found. Mr. Pettifer's meteorite is the fifth to fall in the UK____the year of 1939.

    Mr. Pettifer is glad. "When you think about it coming from so far away.____ really is something strange."

①青春仅仅是随着年龄增长而带来的身体变化

②青春是活力和希望的象征

③青春蕴涵着智慧、勇敢和意志

④青春是从生命潜流中涌动着的一种全新的感觉

完形填空。
    Do you know? There is one language 1 in every country in the world. People, young or old, short or tall, thin or fat, use it very often. It is everybody’s second2 . It is very easy to3, though you can't hear it. It is a sign language.
    When you wave(挥手) to a friend on the street, you are 4sign language. When you 5 up your hand in class, you are saying, “Please ask me, I think I know the answer,” or “I have some questions to6.” When you smile at someone, you mean to be 7to him. When you put your forefinger(食指) in front of your mouth, you mean, “8 quiet, please.” When a policeman wants to 9cars or buses, he raises his right arm. Sign language is very useful in quiet places or places 10 of noise. It is different from body language.

同一时刻，小明在阳光下的影长为2米，与他邻近的旗杆的影长为6米，小明的身高为1.6米，则旗杆的高为（　　）