( )治疗脚气病及多发性神经炎等。 A．维生素B1 B．维生素B2 C．维生素B6

Story     hand      spend      take      unlucky

Dear classmates,

It’s March again. Don’t forget the important project this month----learning from Lei Feng. Would you like to give a _____81_____ to people who need help?

How about _____82_____ some time with the children in the orphanage? We will play games with them and tell them _____83_____. If possible, we will teach them how to make dumplings. Without the love of parents, they are _____84_____. Why not bring them some gifts to add a little cheer to their life?

Want to join us? Let’s meet at 7:00 at the school gate this Saturday. The school bus will _____85_____ us there. Don’t be late.

Students’ Union

用化学符号表示：

（1）2个氢原子_______；

（2）1个氮分子_______；

（3）2个镁离子_______；

（4）水中氧元素显-2价_______；

（5）氩气_________

我国是世界上最大的发展中国家，复兴之路上取得了举世瞩目的成就。但是发展中还是面临很多挑战，下列哪个不属于面临的挑战：

A．人地关系不够和谐

B．区域发展不平衡

C．海洋权益面临严峻挑战

D．地震、泥石流、旱涝灾害多发

汽车在行驶过程中，很多部位会发热，如：①发动机发烫；②轮胎在发热；③刹车片发热；④水箱中的水变热．其中属于通过做功改变内能的是（　　）

A．①②③④

B．②④

C．①③

D．②③

维吾尔族在路上遇到朋友会说（）。

A.你好

B.休巴得勒

C.撒拉嘿呦

D.艾斯拉姆艾来吼