阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。

                                                                              Musicians wanted

      We want four good musicians for our rock band(摇滚乐队). Are you a musician? Can you sing? Can you play the piano, the guitar or the drums? Do you want to be the best musician? If you want to join us, please send(发送) an e-mail. Our e-mail address is rockband2009 @pep.com.cn. Or you can call Mr. Liu at 790-4566.

                                                                             Teachers needed

      Are you an art te acher? Can you paint (绘画) or draw well? Are you good with kids? We need two teachers for our art club. Please find Mrs Wang for more information(信息) or call 628-1183.

如图是观察血涂片时视野的一部分，据图回答问题．

（1）有促进止血，加速凝血作用的是____ ____ ．

（2）患急性炎症时数目会增多的是____ ____ ．

（3）输送氧的是____ ____ ，电子显微镜下观察它的形态是____ ．

（4）①和②在结构上的区别是____ ．

若某多面体的三视图（单位：cm）如图所示,则此多面体的体积是（    ）