第一节短文改错The moment I stepped into high school. I have madeup my mind to study hard in order to enter the gooduniversity. In the first vear. I made a lot of new friendsall of who were excellent. But my scores went up orwhomanddown, which made ne feel stressful. My teacher toldstressedmyself that I needed relaxation. She recommended meNmelisten to music and take more activity. With her helpactivitiesgradual recovered my confidence andmade mucgraaduallyprogress than before. Finally, I was admitted to my idealuniversity

20(1)证明:在△ABC中,由余弦定理得AC=AB3+BC-2AB, BCos∠ABC=2+12-2×2x1x=3则AC2+BC2=AB2,∴AC⊥BC,AD∥BC,∴AD⊥AC又∵PC⊥底面ABCD,ADc平面ABCD,∴PC⊥AD.∵AC∩PC=C,∴AD⊥平面PAC.(2)Q为PD的中点,则S=S,B,于是三棱锥B-APQ的体积与三棱锥B-ADQ的体积31x、3×2=√3所以三棱锥B-APQ的体和"6

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