问题 单项选择题

一种调料的原材料由下 * * 种物质组成:F、G、H、J、K。配方可以是其中两种或两种以上的原材料混合在一起,但必须遵守下列规则:
(1)有F必有H,且1份F必有2份H。
(2)有G必有J,且G、J等量。
(3)H和J不共用。
(4)J和K不共用。
(5)有K必然得到K的量比其他所有的量都大。

以下哪种方法可以使含有2份H和1份K的不合规则的调料合乎规则

A.1份F。
B.2份H。
C.2份K。
D.1份J。

答案

参考答案:C

解析: 2H1K的组合不合规则(5),即K的量没有H大,而加上了选项C的2K,则能使之合乎所有组合规则。故本题应选C。

阅读理解

阅读理解

     For six hours we shot through the landscape of the Karoo desert in South Africa. Just rocks and sand

and baking sun. Knowing our journey was ending,  Daniel and I just wanted to remember all we had seen and done. He used a camera. I used words. I had already finished three notebooks and was into the

fourth, a beautiful leather notebook I'd bought in a market in Mozambique.

     Southern Africa was full of storier and visions. We were almost drunk on sensations. The roaring of the water at Victoria Falls, the impossible silence of the Okavango Delta in Botswana. And then the other

things: dogs in the streets, whole families in Soweto living in one room, a kilometre from clean water.

As we drove towards the setting sun, a quietness fell over us. The road was empty--we  hadn't seen

another car for hours. And as I drove, something caught my eye, something moving next to me. I glanced

in the mirror of the car; I glanced sideways to the right, and that was when I saw them. Next to us, by the

side of the road, thirty, forty wild horses were racing the car, a cloud of dust rising behind them-brown, muscular horses almost close enough to touch them, to smell their hot breath. I didn't know how long they had been there next to us.

     I shouted to Dan: "Look!",  but he was in a deep sleep, his camera lying useless by his feet.

     They raced the car for a few seconds, then disappeared far behind us, a memory of heroic_forms in the red landscape. When Daniel woke up an hour later I told him what had happened.

     "Wild horses?" he said. "Why didn't you wake me up?"

     "I tried. But they were gone after a few seconds."

     "Are you sure you didn't dream it?"

     "You were the one who was sleeping!"

     Typical, he said. "The best photos are the ones we never take."

     We checked into a dusty hotel and slept the sleep of the dead.

1. During their journey in Africa, the two travellers________.

A. made friends with local residents

B. complained about the poor living conditions

C. enjoyed the sunset in the Karoo desert most

D. recorded their experiences in different ways

2. What does the phrase"heroic forms" in Paragraph 4 refer to?

A. Racing cars.  

B. Wild horses.

C. Eye-catching locals.  

D. Running dogs.

3. What did Daniel think when he woke up and was told what had happened?

A. He always missed out on the best thing.

B. He had already taken beautiful pictures.

C. A sound sleep was more important.

D. The next trip would be better.

4. What is the passage mainly about?

A. How to view wildlife in Africa.

B. Running into wildlife in Africa.

C. Tourist attractions in southern Africa.

D. Possible dangers of travelling in the desert

单项选择题