问题 读图填空题

(附加题)下图为利用生物技术获得抗虫棉的过程示意图。据图回答:

(1)在培育转基因植物的过程中,卡那霉素抗性基因(kanr)常作为标记基因,只有含卡那霉素抗性基因的细胞才能在卡那霉素培养基上生长。A过程需要的酶有________、_______。C过程的培养基除含有必要的营养物质、琼脂和激素外,还必须加入_________。

(2)离体棉花叶片组织经C、D过程成功地培育出了转基因抗虫植株,此过程涉及的细胞工程技术是_____________,该技术的原理是_____________。

(3)科学家将植物细胞培养到____________,包上人工种皮,制成了神奇的人工种子,以便更好地大面积推广培养。

(4)如果利用DNA分子杂交原理对再生植株进行检测,D过程应该用_________作为探针。

答案

(1)限制性核酸内切酶      DNA连接酶     卡那霉素

(2)植物组织培养      植物细胞的全能性

(3)胚状体

(4)放射性同位素(或荧光分子)标记的抗虫基因

阅读理解

阅读理解。

    The great ship, Titanic, set off for America in April 1912 on its first trip. It carried more than 1 000

people. 

    The Titanic was the largest and finest ship at that time and it had 16 compartments (密封舱). Even if

(即使) four of those compartments were broken, it would still be able to stay on the sea.

     Four days later, when the Titanic was crossing the sea, the man on watch suddenly saw a very large

iceberg ahead. The great ship turned in time, but soon there was a great noise from below. The captain

went down to see what the matter was. To his surprise, he found the ship was sinking fast because 5

compartments were broken! Hundreds of people jumped into the water. As there were not enough lifeboats,

about 1 500 lives were lost.

根据短文内容,完成下列各题。

1. The ship Titanic set off from England to ____.

2. The captain was ____ to find the ship was sinking fast.

3. How many people lost their lives?

    _________________________________________________

4. Which of the following is NOT true?

                                                                                                                                                       [ ]

A. The captain went down to see what the matter was.

B. Hundreds of people jumped into the sea.

C. 5 compartments of the Titanic were broken.

D. Most of the people were saved.

5. Write down the best title for the passage.

    ________________________________________________

阅读理解

阅读理解。

     Miss Wang is going for a trip in some cities in the country. She wants to go to Beijing or Hangzhou by

plane. But she doesn't know what the weather will be like tomorrow (明天). Now she is watching the weather

forecast (预报) on TV.

     "Good evening! And here is the weather report for the next twenty-four hours. Most of north China will

have a cold day with a lot of snow. There will be a strong wind to the north of the Huaihai River. In the south

it will be fine during the day, but at night it will be rainy. The rain will be very heavy in some places. Beijing

will have snow. The temperature (温度) will be from 0℃ to 3℃.Hangzhou will be foggy (有雾的) with the

temperature from 6℃ to 14℃."

1. What is Miss Wang going to do?

A. She's going for a trip in the country.

B. She's going to give the weather forecast on TV.

C. She's going to watch the weather forecast on TV.

2. When is she watching the forecast?

A. In the morning.

B. At noon.

C. In the evening.

3. What's the temperature in Beijing tomorrow?

A. From 6℃ to 14℃.

B. From 0℃ to 3℃.

C. From 3℃ to 14℃.

4. Can Miss Wang go to Hangzhou by plane tomorrow according to (根据) the weather forecast?

    Why or why not?

A. Yes, because it will be a fine day tomorrow.

B. No, because it will be rainy there tomorrow.

C. No, because it will be foggy there tomorrow.

5. Which of the following is TRUE from the passage?

A. It will be rainy in Beijing tomorrow.

B. It will be fine at night in the south.

C. Beijing and Hangzhou don't have fine weather for trips tomorrow.