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There are many ways for us to reduce(减少) waste. For 16 , we can reduce paper and plastic bags. We can also recycle newspapers, glass, and cans(易拉罐) to make new things. Here are some useful ways to 17 waste. Write on 18 sides of paper Many people write on only one side of their paper. Why not stop wasting the other side? Some students only use half the pages of their 19 before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to 20 e-cards instead? Don’t throw away your old batteries. Maybe you do not know that old batteries make the earth 21 . This is because they have poisonous parts in them. So, don’t throw away batteries. 22 them together. Try to use rechargeable(充电的) batteries for your games and CD players. Give off all your unwanted clothes There are many poor families in China. You may ask your mother to 23 your unwanted clothes. Then you can pass them on to those poor children. You will feel 24 that you are helping someone else. Also, you can understand 25 your friends or relatives(亲戚) want them before throwing them away. 小题1: A.reason B.example C.use D.people 小题2: A.produce B.protect C.reduce D.pollute 小题3: A.every B.both C.all D.one 小题4: A.exercises B.schoolbags C.notebooks D.papers 小题5: A.send B.buy C.receive D.waste 小题6: A.dry B.rich C.clean D.dirty 小题7: A.Throw B.Keep C.Try D.Lose 小题8: A.like B.sell C.throw D.collect 小题9: A.angry B.tired C.moved D.happy 小题10: A.that B.if C.though D.what
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【单选题】某二叉树共有400个结点,其中有100个度为1的结点,则该二叉树中的叶子结点数为()
A.
不存在这样的二叉树
B.
149
C.
151
D.
150
【单选题】某二叉树共有400个结点,其中有100个度为1的结点,则该二叉树中的叶子结点数为
A.
151
B.
不存在这样的二叉树
C.
149
D.
150
【简答题】参照样张制作动画并导出FLASH1.SWF影片文件。
【判断题】DBMS普遍采用日志方法来保证调度的正确性
A.
正确
B.
错误
【简答题】DBMS普遍采用( )方法来保证调度的正确性
【简答题】人类对艾滋病目前还没有找到可以治愈的方法,请分析以下几个题目: (1)下列哪一项是艾滋病的传播途径______ A.性接触传播                B.握手,共同用餐传播 C.蚊虫叮咬传播              D.共用毛巾 (2)在非洲有极少数人天生不会感染艾滋病,他们具有的这种免疫力是属于______ A.先天性免疫                B.后天性免疫 (3)HIV在免...
【多选题】(多选)如果视图具有了( )特征,则不能使用insert、update、delete语句通过视图操纵数据。
A.
定义视图的 from 子句包括多张表,并且视图中的列来自多张表
B.
视图列是从聚合函数中得到的
C.
定义视图的 select 语句是对一张表的全表查询
D.
定义视图的 select 语句包括了 group by 子句
【单选题】下列哪个途径不传染艾滋病
A.
吸食母乳
B.
器官移植传播
C.
共用食具传播
D.
人工授精
E.
共用剃刀、牙刷,可经破损处传染
【单选题】43某二叉树共有400个结点,其中有100个度为1的结点,则该二叉树中的叶子结点数为
A.
151
B.
150
C.
149
D.
不存在这样的二叉树
【单选题】比较适用于表面灭菌的方法是( )
A.
热空气灭菌
B.
火焰干灭菌
C.
紫外灭菌
D.
滤过灭菌
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