将NaHCO3置于干的试管中加热,并使放出的气体依次通过盛有足量过氧化钠和碱石灰

题型:选择题

问题:

将NaHCO3置于干的试管中加热,并使放出的气体依次通过盛有足量过氧化钠和碱石灰的干燥管,最后得到的气体有(    )

A.CO2、、H2O

B.H2O、O2

C.CO2、O2

D.O2

考点:氧化钠单质钠其他钠盐(氯化钠、硫化钠、氮化钠等)过氧化钠
题型:选择题

阅读理解。

     In a surprising result, the No. 69 Middle School girls' football team yesterday beat their school's boys'

team. The boys' team often helped the girls with their training (训练). They had never lost to the girls before,

but this time the girls beat them 4-3.

     After the game, Wu Nai, head of the boys' team, was very unhappy. "We all thought this would be an easy

game," he said. "We never thought a team of girls could beat us. This is the saddest day of my life."

     But Mr Hu, the boys' PE teacher, said he thought the girls should win. "The boys were too confident

(自信)," he said. "I told them before the match that they needed to play well. They all thought that girls'

football was a joke. Now they know better. They didn't play care-fully, and they lost."

     The match had started well for the boys. After 30 minutes, they were winning 2-0. Their best player, Lu

Ming, scored in the thirtieth minute. Earlier, the mid-field player, Ma Zhengquan, had scored the first goal in

only the second minute of the match.

     After the first half hour, the boys seemed to become too confident. At first, the girls had felt a bit nervous (紧张), but then they became more and more confident. Just before half time, Li Xiaolin made the score 2-1.

     In the second half, the boys were the first to score. It was from Lu Ming. After that the boys became lazy,

but the girls kept on working hard. Hao Meiling scored in the 68th minute, to make the score 3-2. Then Li

Xiaolin scored twice in the last six minutes to make the last score 4-3. It was a surprising finish.

     The girls' PE teacher, Miss Wang, was very pleased with their work. "They were great!" She said. "I told

them they could win. I told them that the most important thing was teamwork. The boys' team had some good

players, but my girls were a better team!"

1. Who scored the first goal in the match?

A. Lu Ming.

B. Ma Zhengquan.

C. Li Xiaolin.

D. Hao Meiling.

2. How many goals did Li Xiaolin score?

A. One.

B. Two.

C. Three.

D. Four.

3. Why could the girls' team beat the boys' in the football match?

A. Because the boys' team helped the girls with their training.

B. Because the boys had never lost to the girls before.

C. Because the boys' team won the first half.

D. Because the girls played together better and worked harder.

4. Which of the following is right?

A. The girls made only one goal in the first half.

B. The girls even made 3 more goals than the boys in the second half.

C. Many people thought the girls could beat the boys before the match.

D. The girls' team had some better players than the boys'.

5. Choose the right order according to the passage.

a. The girls' PE teacher told them that they could win.

b. Wu Nai, head of the boys' team was very unhappy.

c. The match started well for the boys.

d. The girls kicked the second goal in the match.

A. a-b-c-d

B. b-c-d-a

C. d-c-a-b

D. a-c-d-b

题型:选择题

我国陆地面积约______ 平方千米,居世界第______位.

题型:选择题
某交流电电源电压的瞬时值表达式为u=6sinl00πt(V),则下列说法中正确的是(  )

A.用交流电压表测该电源电压时,示数是6V

B.用交流电压表测该电源电压时,示数是6V

C.用此电源给电磁打点计时器供电时,打点的时间间隔为0.01s

D.把标有“6V 3W”的小灯泡接在该电源上时,小灯泡将被烧毁

题型:选择题

在一密闭容器中充入一定量的N2和H2,经测定反应开始后的2s内氢气的平均速率:ν(H2)=0.45mol/(L·s),则2s末NH3的浓度为

A.0.50mol/L

B.0.60mol/L

C.0.45mol/L

D.0.55mol/L

题型:选择题

商业助学贷款台账中记录的贷款信息不包括( )。

A.借款人基本信息

B.合同金额

C.风险状态

D.担保方式

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