问题 选择题

下列关于生物进化的叙述,错误的是

A.在研究生物进化的过程中,化石是非常重要的证据

B.一般来说,生物进化的总体趋势是由简单到复杂,由低等到高等,由水生到陆生

C.达尔文认为,生物普遍有很强的繁殖能力,但生物赖以生存的食物和空间是有限的

D.在自然选择过程中只有那些发生变异的个体,在生存斗争中才容易生存下来

答案

答案:D

题目分析:化石是研究生物进化的直接证据,对研究生物的进化非常重要,选项A正确;一般来说生物进化的趋势由简单到复杂,由低等到高等,由水生到陆生,选项B正确;达尔文的自然选择学说认为,生物有过度繁殖的能力,但是生物的生存空间和食物是有限的,生物之间存在着生存斗争,生物存在遗传和变异,适应环境的变异个体容易生存下来,不适应环境的变异个体会被淘汰,故选项C正确,选项D不正确。

选择题

下列选项中的符号分别代表冰雹、小雪、雾和霜冻四种天气现象,其中主要通过液化形成的是:

[ ]

A.冰雹

B.小雪

C.雾

D.霜冻

阅读理解

阅读理解

      Clothes can make phone calls, play music, dial your pal's number, keep you warm during cold

weather and operate your computer.

      This is not a fantasy. A British company, called electrotexiles, has created a wide range of

clothes-clothes tha have minds of their own ! Scientists, working for the company, have invented a

kind of fabric that can be mixed with flexible electronic materials to create intelligent clothing. The

results are electronic garments.

      If you think the weather has to be wired to different devices, think again. These designer clothes

are wirefree, soft to touch and washable! Like any electronic device, these hightech clothes have to

be powered. Currently, a tiny ninevolt battery serves the purpose. But the researchers hope that in the

near future the clothes will generate electricity by using body heat. These clothes are 100% shockproof,

they say.

      The electrotexiles team has also created the world's first cloth keyboard. These keyboard can be

sewn into your trousers or skirt. To use this device, you will have to sit down and tap on your lap!

These "laptap" devices are all set to take over laptop computers!

     Another useful garment is the shirtcummobile phone. This handy invention enables drivers to chat

comfortably with others at the wheel! Other popular electronic wears include the denim (牛仔布)

jacket with flexible earphones sewn into the hoop and the electronic ski jacket with a builtin heater. The

ski jacket is also programmed to send signals to a satellite. This technology is known as global positioning

system and can be used to track lost skiers and wandering kids.

     Having completed the cloth keyboard, scientists have already started to work on a new project-a

necktie that can be used as a computer mouse. What is the next? Do you have any idea?

1. The electronic garments are similar to other electronic devices in that ________.

A. they feel smooth and soft  

B. they use electricity as power

C. they can be washed in water  

D. they are made from flexible materials

2. How will researchers improve these hightech clothes?

A. Body heat will be used as power.

B. The wearer will not get shocked.

C. A tiny ninevolt battery will work.  

D. They will get charged automatically.

3. The main purpose of the text is________.

A. to advertise for an English company

B. to predict the future trend of the products in the company

C. to show how rapidly science develops

D. to introduce some intelligent (智能的) clothing in the company

4. It can be inferred that the author's attitude towards the company is ________.

A. negative (消极的)  

B. casual  

C. optimistic  

D. doubtful