问题 选择题

鉴别下列物质所使用的方法或试剂,正确的是(   )

A.氧化铜和木炭:看颜色

B.铝与铝合金:比较硬度

C.硬水与软水:加明矾

D.:滴入紫色石蕊溶液

答案

B   D、CO2和CO等

题目分析:鉴别物质往往利用物质性质的不同,然后通过物理或化学方法,然后根据出现的不同现象加以区分,A、氧化铜和木炭,都是黑色固体,所以错误, B、一般说来,合金的熔点比各成分低,硬度比各成分大,抗腐蚀性能更好,所以铝合金比铝的硬度更大,正确,C、鉴别方法硬水与软水:用肥皂水,有浮渣产生或泡沫较少的是硬水,泡沫较多的是软水,而不是加明矾,错误,故选B,D、CO2和CO等

阅读理解

One day, Jack’s parents told him that his grandpa would retire(退休) after working for forty years. Jack said in surprise, “I’m only seven, so it means Grandpa has been…er…. A really long time!” His parents said, “Yes. That’s why we are going to have a surprise party for him.”

Jack loved his Grandpa and wanted to do something special for him. He remembered the business card his grandpa had given him two years before. He knew that his grandpa would no longer have the position (职位) on that card, so he decided to make a new one for his grandpa.

When the big day came, Jack was ready. But he didn’t want to put his gift together with others. He carried it around with him the whole evening. When all the other people left, he took his grandpa’s hand and brought him over to a chair and gave him the gift. His grandpa smiled, “Well, it must be a beautiful gift. May I open it now?” “Sure!” Jack said excitedly.

As Grandpa opened the gift, tears came into his eyes. Jack gave him the greatest gift he had ever got! They were business cards with his new position:________! Jack said, “Now your full-time job is my grandpa!”

“Well, how much do I get paid?” his grandpa asked, smiling. “As many hugs(拥抱) as you want!” With these words, Jack gave Grandpa a hug. “Well, I guess that means I’m the richest man in the world!” said Grandpa.

小题1:Jack remembered _____ his grandpa had given him two years before.

A.the birthday card

B.the business card

C.the book

D.the toy小题2:Which of the following is TRUE?

A.Jack’s parents helped him to make the gift for his grandpa.

B.Jack kept his secret about the gift before giving it to his grandpa.

C.Jack bought the business card for his grandpa.

D.Jack wanted his grandpa to make money for him.小题3:What is Jack’s grandpa’s new position?

A.PART-TIME MANAGER

B.FULL-TIME MANAGER

C.PART-TIME GRANDPA

D.FULL-TIME GRANDPA小题4:Why were there tears in Grandpa’s eyes?

A.Because he would lose his position.

B.Because he was not cared for.

C.Because he was moved by Jack’s gift.

D.Because he was unhappy.

判断题