【简答题】Some policymakers believe that bio-fuel could help to save American farm, besides relieving pressure on______.
【单选题】To help the sick people in the hospital is _____ for me .
【单选题】需求价格弹性是指()变动百分率和()变动百分率的比值。
【多选题】为了有效的防止抹灰层的空鼓与开裂,在监督控制中应加强检查()
【单选题】Good _________ habits help me get good grades.