【简答题】蛔虫表皮层向内突出加厚形成四条表皮层线,分别是 ___________ 、 ___________ 和两条 ____________ ,它来源于 _________ 胚层。
【单选题】We hope that our customers can______ advantage of this new service.(2014.6)
【简答题】蛔虫表皮层向内突出加厚形成四条表皮层线 , 分别是 ( ) 线 、 ( ) 线 和 左右 两条 ( ) 线 , 它来源于 ( ) 胚层 。
【单选题】6 6. The rope is not strong enough to ______ the weight of the big case.
【单选题】If you want to get there before dark, you should start your journey ______. (2014.6)