问题 单项选择题

APU滑油系统的正常供油压力是()

A.60-75PSI;

B.85-95PSI;

C.135-150PSI。

答案

参考答案:A

阅读理解

阅读理解。

     Katie wrote a letter to her Chinese teacher and got a reply from him. Read their letters and answer the

questions.

Dear Mr. Hu,

     My family moved here from England three months ago. I can't speak Chinese well, and it's difficult for

people to understand me. I'm losing confidence.

     Could you please tell me what I should do?

Katie Dear Katie,

      I'm glad that you let me know about your problem. Here are some things you can do:

     1. Your class is going to have a Story Time this month. All of you should tell stories. You should tell one,

too. I'm sure you can learn a lot from doing so.

     2. Try to practise speaking with your teachers and classmates. Don't be afraid.

     3. Talk to Nanako and Yu-kim. Nanako is from Japan,and Yu-kim is from Korea. They might be able to

give you some advice.

     4. Some foreign students told me that watching Happy Times on TV can help. The language is easy.

     Please try these ideas and see if you can do better. Don't worry too much. I have confidence in you.

                                                                                                                                          Mr. Hu

1. Katie's family has been here for ________.

A. 3 years

B. 3 months

C. 6 years

D. 6 months

2. What is Katie's problem?

A. She misses her parents.

B. She can't speak Chinese well.

C. She is taking too many classes.

D. She thinks the teachers are too serious.

3. Happy Times can help students with their ________.

A. Chinese

B. English

C. Japanese

D. Korean

4. Which is NOT Mr. Hu's suggestion in his letter?

A. Telling stories in class.

B. Watching a TV program.

C. Writing a letter every day.

D. Talking to other foreign students.

5. From the letter we know that ________.

A. Mr. Hu is Katie's English teacher

B. Katie's family came from Australia

. Katie's going to have a Story Time next month

D. Mr. Hu tries to help Katie to learn Chinese well

单项选择题

最近,天文学家在距地球至少110亿光年的宇宙深处发现,众多的新星正在早期星系内快速生成。若进一步的研究能够核实那些星系的实际年龄的话,则这一新研究的成果将意味着星系诞生的高峰期远较人们以前确认的年代为早,星系生成的速度也大大高于从前的估算,宇宙早期的演化史可能需要科学家们去重新认识。
确定大量星系生成的年代对于加深了解宇宙的起源和演化具有十分重要的意义,而科学家们也一直在宇宙深处不断搜寻亿万恒星的孕育之处。然而,由于形成恒星的区域常常笼罩有浓重的星际尘埃,掩蔽了新星发射的可见光及红外辐射,而距离更远的恒星和星系所发出的辐射传到地面时已属于信号极其微弱的亚毫米波段,探测难度相当巨大。
科学家们报告说,他们探测到了与哈勃太空望远镜照片上5个古老昏暗的星系相对应的亚毫米波辐射源,并根据辐射波的强弱特点判断,这些早期的星系可能正在以高于银河系100倍的速度缔造新的恒星。
目前,天文学界普遍认为,星系大部分形成于宇宙诞生后的80亿~100亿年间,但新的发现却清楚地显示,星系可能早在宇宙处于20亿年的早期阶段就已经大量涌现了。
天体物理学家佩蒂尼评论说,新的发现是非常令人振奋的科学进展,有助于解答宇宙是如何从热大爆炸后的初期平稳阶段演变为今日所见的浩繁星系的。

对“科学家探测恒星孕育之处难度巨大”的原因解释当的一项是:

A.新星生成的区域常常为浓重的星际尘埃所笼罩。
B.新星和星系所发出的辐射信号极其微弱。
C.有的恒星和星系距离地球太遥远。
D.宇宙深处的恒星和星系的辐射信号在地面上的探测难度相当巨大。