When a teacher intends to present or explain a new language point，which of the following grouping methods is mostly recommended？

The three major causes for errors are: mother tongue interference,（）,and inappropriate teaching materials or methods.

Project selection methods involve measuring value or attractiveness to the project owner or sponsor and may include other organizational decision criteria （）is not a project selection method.

回交育种（Backcross breeding method）

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

在回交育种法中，目标性状的提供者称为（），目标性状的接受者称为（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述烟草栽培面向21世纪发展对策

烟草育种学的性质。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

Cross breeding（杂交育种）