18.解:(1)证明:连AB1交A1B于E,连DE,因为ABB1A1是矩形,所以E是AB1的中点,(2分)又AC∥平面A1BD,且DE是平面ACB1与平面A1BD的交线,所以AC∥DE,(4分)又因为E是AB1的中点,所以D是CB1的中点(5分)(2)因为AA1∥BB1,所以CB1与AA1所成的角为∠CBB,(6分)又三棱柱ABC-A1B1C1是直三棱柱,所以△CB1B是直角三角形,在Rt△CB1B中,sin∠CB1B=1-3,又cB=2,所以CB√3,可得BB1=3,(7分)则有VcmA×2×3×.-2,(9分V。-A=3××2×3×3=23,(1分)所以vam2-2(12分)

第四部分写作第一节短文改错(共10小题;每小题1分,满分10分Last summer vacation, I work in a printing shop. That was my first job and it was a good chance for me to gain experienees. SoI took them seriously. At A beginning, the boss let me in do the cleaning work, which made me feel losing. Because I have preparedto learn how to do the print work when others used the machine. i ally, when the boss taught me to use the machine, I learned veryLalerquickly. Though i did not get much salary, I felt so proud it: myself, because I enhanced not only my self-worth and ability

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