问题 多选题

铁是一种应用广泛的金属,下列有关铁的说法中,正确的是(  )

A.生铁不能完全溶解在足量的稀硫酸中

B.铁在干燥的空气中容易生锈

C.用稀硫酸可以除去混在铜粉中的少量铁

D.铁在氧气中燃烧生成黑色的氧化铁

答案

A生铁中主要是铁和碳,稀硫酸只与铁反应,不与碳反应;B铁在潮湿的空气中易生锈;C稀硫酸只与铁反应,不与铜反应,因此可以除去铁粉;D铁在氧气中燃烧生成黑色的四氧化三铁.故选A C

判断题
阅读理解

One evening in November, Berlin received a telephone call from Mrs. Green. “Please, Dr Berlin, come to my house. I had 50,000 dollars on my desk and now it is gone.”

Dr Berlin arrived at Mrs. Green’s house at eight o’clock. First he asked Mrs. Green, “When did you see the money last?”

“At seven o’clock. I put it on my desk in my living room. Then I went to wash my hair. I came back at seven thirty and the money was gone.”

“I see.” Dr Berlin said. “Were you alone in the house?”

“No. My sister’s son Jack is here, too.” Then Dr Berlin and Mrs. Green went to Jack’s room.”

“Please, sit down,” Jack said. Dr Berlin sat on the only chair in the room, and the chair was cold. He also saw some books on the ground near his feet.

“What have you been doing this evening?” Dr Berlin asked.

“I came home at six-thirty, and went right to my room. I’ve been sitting in that chair and reading all the evening. I never got up and I never left the room. Maybe somebody came into the house and took my aunt’s money.”

After hearing that, Dr Berlin was clear about who had taken the money.

59. When did Dr Berlin answer the phone from Mrs. Green?

A. At 6:30      B. At 7:00      C. After 7:30  D. At 8:00

60. Where did Mrs. Green put her money?

A. In her living room.   B. In her washing room.

C. In Jack’s room.                  D. In her office.

61. When did the thief take Mrs. Green’s money?

A. Before Mrs. Green came back home.

B. When Jack was reading.

C. After Mrs. Green went to wash her hair.

D. When Dr Berlin was answering the phone.

62. Which of the following is WRONG?

A. Mrs. Green didn’t live alone.     

B. Jack had given a careless reply (回答).

C. Dr Berlin found out who had taken the money.

D. Jack had been really reading books all that evening.