八年级上册英语周报答案

5.C【解析】由余弦定理7=b2=a2+c2-2acos120°=4+c2+2c,即c2+2c-3=0,解得c=1或c=-3(舍去)以边c所在直线为轴,其他两边旋转一周所形成的几何体如图中阴影部分所示,其体积为圆锥AO的体积减去圆锥BO的体积,即x(3)2×2-(3)21=x.故选C项.

应用文写作( One possible versionDear FrankWe plan to participate in the weeklong labor practice in the school field base scheduled from August Ito 8. Im writing to invite you to Join usThe base offers free accommodations and various activities. Participants can learn to do outdoor worklike farming or gardening. The art of making tea, which interests you very much, is also taught. Whatattracts me most is that we'll learn to raise animals such as goats or rabbitsIn the practice, we can experience the value of labor and expose ourselves to a wide range of practicalskills, which will surely benefit usLooking forward to your replyYoursLiH

以上就是八年级上册英语周报答案，更多英语周报答案请关注本网站。