初一20192022英语周报答案

5.C【解析】平行光从AB边垂直射入玻璃砖,恰好在BC边发生全反射,由几何关系知,临界角为C=45°,由sinC=可得,n=√2≈1.414,光在玻璃砖中传播的距离为d,设速度为,则=,=,解得t=24,代入数据解得t≈2.36×10-10s,故选C项。

第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a debreath. I saw two young men in canoes, racing each other.I was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and Bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded me ifor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

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