用来计数胸椎的骨骼标志做为起点的棘突是
A．第4胸椎棘突B．第6颈椎棘突C．第7颈椎棘突D．第1胸椎棘突E．第5颈椎棘突
参考答案：C
—I’m sorry that John is out.
—Please ask him to call me as soon as he ____.
A．returned
B．returns
C．will return
D．is returning
木门窗制作时木材的含水率不应大于20%。
