某用电器的电阻是120Ω，要使电路中的总电流的1/5通过这个用电器，就跟这个用电器并联一个____ Ω的电阻；若要使用电器两端的电压是总电压的1/5，则应跟这个用电器串联一个____ Ω的电阻．

图是南半球某地东西向的地质构造剖面示意图，从图中可知（    ）

看图写句子。

下列各项中，对作品故事情节的叙述有误的一项是（      ）

​任务型阅读

    John had a busy weekend. On Saturday morning, he went to the library and studied math. On Saturday afternoon, he went to the park. He played tennis with his friend. Lisa was busy on Saturday, too. She cleaned her room in the morning. In the afternoon, she wrote a letter to her cousin(表妹).

    On Sunday morning, John and Lisa read books at home. On Sunday afternoon, they practiced English. In the evening, they saw an interesting talk show with their parents. They had great fun.