【单选题】
A pen pal provides good motivation for your writing because he or she ____.
①
lives far away from you
②
knows China a lot so that you can have a lot to talk about
③
also keeps a diary
④
may inform you of many interesting things in his or her culture
【单选题】
彩色电视画面能够准确反映物体的颜色，取决于在光线的各种色温条件下，对摄像机的白平衡的正确调节，那么白平衡是以什么颜色为标准的？
①
18%中级灰的“白色”
②
18%中级黑的“白色”
③
16%中级灰的“白色”
④
16%中级黑的“白色”