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2023-10-10  30
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] 【D7】
选项
答案 N
解析 本句主干结构完整，因此应填入一个副词修饰placed。此处讲的是将接穗怎样插入砧木上的切口中。结合备选副词可知，应该是“牢靠地，紧紧地”插入，以免其掉落，故选N)securely。
转载请注明原文地址:https://tihaiku.com/zcyy/3086387.html
相关试题推荐
随机试题
最新回复(0)