It is very important to state explicitly what you want students to gain from the lesson. Explicit statements here help you to _______.   

A、<span style="font-stretch: normal;font-size: 9px;font-family: &#39;Times New Roman&#39;">&nbsp;</span>preserve the unity of your lesson<span style="font-size: 18.018px;">&nbsp;</span>

B、<span style="font-size: 18.018px;">evaluate students’ success at the end of, or after, the lesson.</span>

C、<span style="font-size: 9px; font-stretch: normal; font-family: &#39;Times New Roman&#39;;">&nbsp;</span><span style="font-size: 18.018px;">gain more praise &nbsp;</span>