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

游客2023-08-08 29

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【C1】_________cut from existing trees and plants. This is called grafting (嫁接).
   Farmers cut branches or young growths, called【C2】_________, 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【C3】_________the graft is called the root stock. Over time, the【C4】_________from the two plants grow together. The grafted plant begins to【C5】_________the leaves and fruit of the scion, not the root stock.
   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【C6】_________of the letter V. A place is cut in the root stock to accept the scion. The scion is then【C7】_________ placed into the cut on the root stock. Growth medium is put on the【C8】_________to keep it wet and help the growth.
   Grafting can join scions with【C9】_______qualities to root stock 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【C10】_______important.
A) blossoms
B) pieces
C) composes
D) parts
E) securely
F) extremely
G) buds
H) agreeable
I) accepts
J) relatively
K) grow
L) desirable
M) produce
N) shape
O) joint [br] 【C6】

选项

答案 N

解析

转载请注明原文地址:http://tihaiku.com/zcyy/2908165.html

相关试题推荐

随机试题

最新回复(0)

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

农业是国民经济的基础。农林牧渔互相结合的方针Agricultureisthefoundationofthenationaleconomy．apo

第一产业／农业primaryindustry；agriculture