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题型:单选题 题类:真题 难易度:普通
Is there life on other planets? There are seven other planets in our {#blank#}1{#/blank#} system, but {#blank#}2{#/blank#} of them has an environment like that of the {#blank#}3{#/blank#}. Spaceships from the earth have done surveys of the other planets, but they have not found any life there. Why has no one from other planets tried to {#blank#}4{#/blank#} with us? It is true that scientists have not discovered life on other planets in the {#blank#}5{#/blank#} yet, but some scientists believe that they will find it some day.
提示:1).列举危害学生健康的因素,如吃快餐食品、打电子游戏和缺乏睡眠;
2).列举保持健康的具体措施。
How to keep healthy
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