一级服务标准中保洁服务要求高层按层，多层按幢设置垃圾桶，每日清运（）。 A.1次

— Does a kangaroo has a pouch? 

— ____________[ ]

A. Yes        

B. No        

C. /

( )是进行施工成本偏差分析最常用的一种方法。

A．表格法

B．横道图法

C．曲线法

D．直方图法

读下面的短文，根据短文的意思用括号内的所给词的正确形式填空

Jack loved ice cream. He wanted to have ice cream every day.

On his birthday, Jack wanted ice cream, but his parents小题1:_______ （give）him a pet turtle as a present instead. Jack tried to teach his turtle to play games, but it couldn’t carry a ball in its mouth. It couldn’t jump high or run very小题2:_______ （quick）. Jack didn’t really like his turtle. He thought it was a boring pet.

One day, he 小题3:_______ （take）the turtle out of its box and found it didn’t move. Jack took it to his mom. “Mom,” he said. “My turtle is not 小题4:_______ （move）. I think it’s dead.”

“Don’t be sad,” she said. “We’ll put him in a box and bury (埋) him. Then we’ll go to the store and have some ice cream to make you feel 小题5:_______ （good）.”

Ice cream! Jack began to feel happy. Then his mother saw the turtle move.

“It’s all right!” she said. “Your turtle isn’t dead after all!”

“Oh,” said Jack. “Can I kill it?”

运用化学知识，对下列日常生活中一些事物的分析正确的是（　　）

A．铜制品在潮湿的空气中不会生锈

B．关闭门窗用木炭火烤，易发生煤气中毒

C．用食盐水除出水壶中的水垢

D．食品中充N₂可防腐，因为N₂能消毒杀菌