阅读下列材料: 英国学者李约瑟曾提出了这样一个问题:“中国古代在经验技术的发展水

题型:材料题

问题:

阅读下列材料:

英国学者李约瑟曾提出了这样一个问题:“中国古代在经验技术的发展水平上远远超过西方,但为什么近代科学却首先在西方诞生,而中国反而远远落后在西方后面呢?”这个疑问后来被学术界命名为“李约瑟难题”,引起国内外学者的广泛关注。

请回答:

(1)以天文学为例,列举三个中国古代居世界领先水平的天文科技成就,说明中国古代在经验技术的发展水平上远远超过西方。

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(2)近代科学技术首先在西方诞生,被称为“近代科学之父”的是哪位意大利科学家?请写出他的主要科技成就及意义。

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考点:《石氏星表》和浑仪牛顿和经典力学(《自然哲学的数学原理》)
题型:材料题

设a、b为有理数,下列命题正确的是(  )

A.若a≠b,则a2≠b2

B.若|a|=|b|,则a=-b

C.若a>b,a2>b

D.若a、b不全为零,则a2+b2>0

题型:材料题

商场先将商品按成本价提高80%,然后在广告中写到“大酬宾,八折优惠”,照这种做法,卖出一台实际售价是6480元的液晶电视,该商场可赚多少钱?

题型:材料题

阅读理解。

     Here are a few tips we've put together to help you learn English well.

     Speak, speak, speak!

     Practise speaking as often as you can-even speaking to yourself is good practice. Try recording yourself

whenever you can. Compare your pronunciation with the master version, see how you can do better and have

another try. If you do this several times, you will find that each version is better than the last.

     Why not learn with someone else? 

     It helps if you can learn with someone else. If you can persuade a friend or family member to study with

you, it will make you keep working. Arrange times to meet and set goals for the week, and test each other

regularly.

     Don't get stuck (卡住) by a word you don't know Practise improvising (即兴的) ways of getting your

meaning across while speaking spontaneously (本能), even if you don't know the exact words or phrases.

Think of things you might want to say whenever you have spare time. A basic example is the use of tenses.

If you don't know the past tense but want to talk about yesterday, use the verb in the present tense and use

the word for"yesterday". Use facial expressions, hand movements, anything to get your meaning across.

     Language learning is also about intuition (直觉) Guesswork is important in learning a new language. When

listening to recorded material, you aren't expected to understand everything first time round. If you play the

same piece several times, you will most probably understand something new each time. Learn to make

maximum use of all the clues you can pick up. For example, what do the speakers sound like? Happy? Angry?

Calm? Etc.

     Build up your vocabulary A wide vocabulary is the key to successful language learning but don't try to

learn too much at once. It's best to study frequently, for short periods of time. Take a maximum of six or

seven items of vocabulary and learn them. Put them into sentences to fix them in your mind, then come back

to them later. Much of the vocabulary in the course is presented by topic. And above all, have fun!

1. Why should one have himself recorded when practicing speaking?

A. To encourage others to start.

B. To record his own progress.

C. To improve his speaking.

D. To compare himself with others.

2. Which of the following is the most important in learning English?

A. Speaking.

B. Pleasure. C. Intuition.

D. Vocabulary.

3. It is important in Tip 3 that _____ is helpful when you are learning English.

A. body language

B. a good memory

C. a good friend

D. a proper dictionary

4. Which of the following seems NOT to be true in learning a language?

A. Practice makes perfect.

B. A good beginning is half done.

C. Rome is not built in a day.

D. Don't run before you can walk.

题型:材料题

传动箱内的润滑油,每运转()更换一次。

题型:材料题

颅内动脉瘤的好发部位是()

A.海绵窦

B.后交通动脉

C.前交通动脉

D.椎—基底动脉系统

E.颈内动脉系统的分叉部

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