圆锥形套筒冠义齿固位支持型固位体的内冠内聚角度为 A．0° B．1°～2° C．2°

世界上储量最大、出产和输出石油最多的地区是

A．中东

B．东南亚

C．拉丁美洲

D．中亚

螺旋CT扫描图像重建前所作的数据预处理的方法，通常被称为

A．卷积

B．原始数据

C．线性内插

D．模数转换

E．迭代

阅读理解。

     Brenda Bongos was a happy, artistic girl. She had one big ambition-to play the drums in a band. But

one big obstacle lay in her way. To be good enough to play in a band, Brenda had to practice a lot, but

she lived next-door to a lot of old people. Many of them are sick. She knew that the sound of beating

drums would really get on their nerves. So, she had tried playing in the strangest places: a basement, a

kitchen, and even in a shower. But there was always someone it would annoy.

    One day, while watching a science documentary on TV, she heard that sound cannot travel in space,

because there's no air. At that moment, Brenda Bongos decided to become a sort of musical astronaut.

    With the help of a lot of time, books and work, Brenda built a space bubble. This was a big glass ball

connected to a machine which sucked out all the air inside. All that would be left inside was a drum kit(成套设备) and a chair. Brenda got into the space suit she had made, entered the bubble, turned on the

machine, and played those drums like a wild child.

    It wasn't long before Brenda Bongos came very famous. Many people came to see her play in her

space bubble. Shortly afterwards she came out of the bubble and started giving concerts. Her fame

spread so much that the government suggested that she be part of a unique space journey. Finally,

Brenda was a real musical astronaut, and had gone far beyond her first ambition of playing drums in a

band.

    Years later, when asked how she had achieved all this, she thought for a moment, and said: ''If those

old people next - door hadn't mattered so much to me, I wouldn't have found a solution, and none of this would have ever happened.''

1. Why did Brenda try to play in the strangest places?

A. Because she didn't want others to hear her play.

B. Because she didn't want to disturb others.

C. Because she didn't have a large house.

D. Because she liked to play in strange places.

2. Brenda started to give concerts _______ .

A. after she practiced in her space bubble

B. when she became part of the unique space journey

C. after she became a real musical astronaut 

D. when people came to see her in the space bubble

3. Brenda became famous because _______ .

A. she made a space suit

B. she became a real musical astronaut

C. she played drums in her space bubble

D. she played drums in a band

4. Which of the following can be used to describe Brenda? 

A. kind, hardworking and clever

B. brave, kind and hardworking

C. lovely, brave and kind

D. nervous, kind and clever

5. We can draw a conclusion from the passage that: " _______".  

A. He laughs best who laughs last

B. It's never too old to learn

C. Two heads are better than one

D. One good turn deserves another

食品生产中用主要水部分有哪些。

图示正弦交流电路中，各电压表读数均为有效值。已知电压表V、V₁和V₂的读数分别为10V、6V和3V，则电压表V₃读数为：().

A．1V

B．5V

C．4V

D．11V