预防动脉粥样硬化应首先治疗()
A.高脂血症
B.高血压
C.口腔疾病
D.心脏病
E.糖尿病
参考答案:A
-Do you often go to the cinema?
-No,________.I’ve been writing a novel this year.[ ]
A.often
B.frequently
C.occasionally
D.nearly
禾本科植物叶的结构与双子叶植物有何不同?