5形2A1(用节二年1,16.1延长DA至N,使得AD=AN,连接NB,则PN∥AM,NB∥AC.所以过点P且与平面MAC平行的平面PBN,即为a,所以PB即为l,所以l与CD所成角为∠PBA=45°,故其正切与值为117.解:(1)散点图如下销售额(万元,),)斜A3:=35

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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