2021-2022年英语周报七年级新目标第4期答案

6.C【解析】当大量处于n=4的激发态的氢原子向低能级跃迁时,会辐射出C=6种不同频率的光子,A项错误;当辐射光子的能量超过4.54eV时,才能使钨发生光电效应,因此只有氢原子从高能级跃迁到基态时,辐射的光子才能使钨发生光电效应,B项错误;氢原子辐射一个光子后,跃迁到低能级,氢原子的核外电子的动能增大,速率增大,C项正确,D项错误。

Paragraph 1Several days later, when Jenny's father came in toread her a story, Jenny was waiting anxiously for him on thebed. When listening to the story Jenny was totally absentminded, with her hands holding the necklace tightly andfirmly. When the story came to an end, unexpectedlyJenny offered her beloved necklace to her father, with herfingers trembling automatically. No one knew what thenecklace meant to her. She whispered to her father, softlyand gently, "Daddy, you know I love you more than thenecklace. "Then the necklace slid into her father's handsdeterminedlyParagraph 2Holding the plastic pearl his daughter offered, thefather dragged out a blue box. Much to Jennys amazement, a beautiful real pearl necklace lay peacefully in thebox, which set her heart racing. Jenny froze there,athrilled expression twisting her face. Before Jenny was ableto say something, her father brushed a warm kiss on herface and gathered her into his arms. Holding the genuinenecklace in her hand, Jenny lifted her lip, tears beginningto blur her vision

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