开展社区口腔保健应首先（）
A.口腔健康咨询
B.口腔健康检查
C.问卷调查
D.制订口腔保健计划
E.口腔预防保健措施
参考答案：D
已知梯形的中位线长是4cm，下底长是5cm，则它的上底长是 cm.
According to a study carried out by an American university, when you eat has ______ on your mood as ______ you eat.
A．much of as an effect; what
B．much of as an effect; which
C．as much of an effect; what
D．as much of an effect; which
