【单选题】Trees that grow faster are developed by ______.
A.
planting many trees and fertilizing them
B.
collecting seeds from strong, slow growing trees
C.
selecting the seeds of the fastest growing trees
D.
feeding them high-energy plant foods
【单选题】关于Delete语句,下列说法错误的是( )
A.
Delete语句不能删除单个列的值,只能删除整行数据
B.
要删除单个列的值,可以使用Update语句,将其更新为Null
【单选题】关于DELETE语句的说法错误的是( )。
【单选题】UPDATE 语句与 DELETE 语句的一个区别是什么?
C.
DELETE 语句不能使用 WHERE 子句。
【单选题】If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline.
【单选题】— What will the land be used for? — _____. [ ]
B.
Young trees will be planted
C.
They will plant young trees
【单选题】What is the passage mainly concerned withy
A.
The benefits of trees.
B.
Trees and soil protection.
C.
The various uses of trees.
D.
Different attitudes toward trees.