题型:阅读选择 题类:真题 难易度:普通
Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won't fall easily. Then we say that its center of gravity is low.
Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).
Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.
color, last, his, be, who, boy, brother, name, friend, here, first |
Hi, I'm Mary Smith. Mary is my first name, and Smith is my{#blank#}1{#/blank#}name. {#blank#}2{#/blank#} are two photos of my family. In the{#blank#}3{#/blank#}photo, you can see two{#blank#}4{#/blank#}. The boy in a green T-shirt Is my cousin.{#blank#}5{#/blank#}name is Bob. He's my uncle's son. He is five years old. The boy in a blue and black T-shirt is my{#blank#}6{#/blank#}. He is ten years old.
In the next photo{#blank#}7{#/blank#} a boy and a girl. They are two{#blank#}8{#/blank#}of mike. The boy is Jack. He is in a blue T-shirt.{#blank#}9{#/blank#}is the girl? She is Jack's sister. Her{#blank#}10{#/blank#}is Jane. The{#blank#}11{#/blank#}of her dress is orange. She is always in orange. We are in the same school.
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