<span style="background-color:#ffffff;color:#222222;">Many of my students, <i>____</i> Zhang Hua and Li Yong, are working hard, and we should learn from him.</span><br style="background-color:#ffffff;color:#222222;"/><br style="background-color:#ffffff;color:#222222;"/><span style="background-color:#ffffff;color:#222222;">A. such as B for example</span><br style="background-color:#ffffff;color:#222222;"/><br style="background-color:#ffffff;color:#222222;"/><span style="background-color:#ffffff;color:#222222;">I don't know the difference between the two and therefore I can't decide which one to choose./ Can you help me?</span>