2. 职称英语
  3. We often think of agriculture as planting seeds and harvesting crops. But man

We often think of agriculture as planting seeds and harvesting crops. But man

游客2024-08-01  46
问题    We often think of agriculture as planting seeds and harvesting crops. But many crops do not come from seeds. Many kinds of trees and plants are grown from【D1】______cut from existing trees and plants. This is called grafting (嫁接).
   Farmers cut branches or young growths, called【D2】______, from one plant and place them on a related kind of plant. The branch or bud that is grafted is called a scion (接穗). The plant that【D3】______the graft is called the rootstock. Over time, the【D4】______from the two plants grow together. The grafted plant begins to【D5】______the leaves and fruit of the scion, not the rootstock.
   A graft can be cut in several ways. A cleft graft (割接，劈接), for example, requires a scion with several buds on it. The bottom of the scion is cut in the【D6】______of the letter V. A place is cut in the rootstock to accept the scion. The scion is then【D7】______placed into the cut on the rootstock. Growth medium is put on the【D8】______to keep it wet and help the growth.
   Grafting can join scions with【D9】______qualities to the rootstock that is strong and resists disease and insects. Some common fruit trees such as sweet cherries have to be grafted.
   In an age of high-technology agriculture, grafting is a low-technology method that remains【D10】______important.
A) accepts F) desirable K) parts
B) agreeable G) extremely L) pieces
C) blossoms H) gradually M) produce
D) buds I) grow N) securely
E) composes J) joint O) shape [br] 【D5】
选项
答案 M
解析 根据句子结构可知，空格前为动词不定式符号to，此处应填入动词原形。根据句意可知，被嫁接的作物会开始______接穗的而非砧木的叶子和果实。叶子和果实是生长出来的，故选M)produce。
转载请注明原文地址:http://tihaiku.com/zcyy/3701003.html
相关试题推荐
随机试题
最新回复(0)