久久综合色一综合色88欧美|久久er热在这里只有精品66|国产福利一区二区不卡|日本精品动漫二区三区

    1. <address id="l3apk"><var id="l3apk"><source id="l3apk"></source></var></address>

      職稱英語理工A考試押題閱讀判斷練習(xí)17

      時(shí)間:2016-09-20 15:36:24 娛樂資訊 我要投稿

      2017年職稱英語理工A考試押題閱讀判斷練習(xí)17

      為您整理了“2017年職稱英語理工A考試押題閱讀判斷練習(xí)17”,方便廣大網(wǎng)友查閱!更多職稱英語考試相關(guān)信息請(qǐng)?jiān)L問職稱英語考試網(wǎng)。
      Plants in Desert

      Only special plants can survive the terrible climate of a desert, for these are regions where the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plants from the sun's ray. Another problem is the fact that there are frequently strong winds which drive small, sharp particles of sand into the plants, tearing and damaging them. The most difficult problem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring.

      Grasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form of seeds. These seeds remain inactive unless the right amount of rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time that the water from the spring rains disappears —— just a few weeks after it falls —— such plants no longer need any.

      The perennials have special features which enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small shoot system above ground. The large root network enables the plant to absorb as much water as possible in a short time. The small shoot system, on the other hand, considerably limits water loss by evaporation.

      Another feature of many desert perennials is that after the rainy season they lose their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation during the dry season. Then, in next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.

      16. Ordinary plants are unable to survive in the desert mainly because of the changeable weather.

      A. Right B. Wrong C. Not mentioned

      17. Grasses and flowers in desert are able to survive because they stay in the form of seeds to wait for the right amount of water to come.

      A. Right B. Wrong C. Not mentioned

      18. Grasses and flowers in the desert whose life cycles are short shows their ability to adapt to the quick disappearance of rainwater there after it falls in spring.

      A. Right B. Wrong C. Not mentioned

      19. Winter is the toughest season for grasses and flowers to survive in desert

      A. Right B. Wrong C. Not mentioned

      20. The shoot system of perennials can help the plants absorb less of the sun's ray.

      A. Right B. Wrong C. Not mentioned

      21. The theme of the second last paragraph is why the perennials can survive as plants for several years.

      A. Right B. Wrong C. Not mentioned

      22. Desert perennials lose their leaves after the rainy season just as trees lose theirs in wetter climates before winter arrives, but the reasons for this feature are

      different.

      A. Right B. Wrong C. Not mentioned

      【參考答案】16. B17. A18. A19. C20. B 21. A22. B

      【2017年職稱英語理工A考試押題閱讀判斷練習(xí)17】相關(guān)文章:

      1.2017年職稱英語理工A考試押題閱讀判斷練習(xí)18

      2.2017職稱英語考試?yán)砉考試押題:閱讀判斷

      3.2017年職稱英語理工類A級(jí)閱讀判斷模擬練習(xí)(2)

      4.2017年職稱英語衛(wèi)生A模擬試題閱讀判斷

      5.2017職稱英語考試?yán)砉ゎ怋級(jí)閱讀理解練習(xí)題(六)

      6.2017職稱英語考試?yán)砉ゎ怋級(jí)閱讀理解練習(xí)題(四)

      7.2017職稱英語考試?yán)砉ゎ怋級(jí)閱讀理解練習(xí)題(三)

      8.2017職稱英語考試?yán)砉ゎ怋級(jí)閱讀理解練習(xí)題(二)