设x,y为实数,若4x2+y2+xy=1,则2x+y的最大值是( )。
根据汉语提示完成句子。
1. I can't afford to buy the dictionary, because I have_______ _______ _______ (用完了) my money. 2. Children are very _______ _______ _______ (对……感兴趣) computer games.
3. Nearly all the singers sang very _______ (清楚地) and looked comfortable _______ _______
(在舞台上).
4. I have no_______ (机会) to see her. What a pity!
5. Many people agree that they _______ _______ (取得进步) by singing English songs.
目前我国治疗血吸虫病普遍采用的药物是
A.酒石酸锑钾
B.呋喃丙胺
C.血防846
D.硝硫氰胺
E.吡喹酮