单选题：Questions are based on the following passage. We often think

Questions are based on the following passage.
We often think of agriculture as planting seeds and harvesting crops．But many crops do not comefrom seeds．Many kinds of trees and plants are grown from 1 cut from existing trees and plants.This is called grafting (嫁接).
Farmers cut branches or young growths, called2, from one plant and place them on a relatedkind of plant．The branch or bud that is grafted is called a scion (接穗)．The plant that3the graftis called the root stock．Over time, the4 from the two plants grow together．The grafted plantbegins to5the 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 withseveral buds on it．The bottom of the scion is cut in the6of the letter V．A place is cut in the rootstock to accept the scion．The scion is then 7 placed into the cut on the root stock．Growthmedium is put on the8to keep it wet and help the growth.
Grafting can join scions with9 qualities to root stock that is strong and resists disease andinsects．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 remains10 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

（1）应选