排舞参与形式非常灵活，可独舞，可集体跳，可成千上万齐跳，新加坡曾有11967人一起跳

阅读下面短文，根据短文内容判断句子的正误。正确的涂A，错误的涂B．

Jobs Wanted

Help for school trip

Are you good with kids(小孩子)? We need help for our school trip. Can you help with music? Then call Henry at 897-4592.

Help for sports in English

Are you busy after school?Are you good at speaking English?We need help with sports for English. Please come to the Sports Center or call Mr Smith at 670-3482.

Teachers wanted for swimming club

Do you want to teach in a swimming club? You need to work in the evenings. Please call Mike at 670-3452.

Help for old people

We need help at the old people’s home. Are you good with old people? Do you have time on weekends?You can talk to them or play games with them. They can tell you their stories .Please call Mr Brown at 483-0319.

小题1:Alicia can help kids with music. She may call Henry at 784—3204．

小题2:Melisa can sing and dance well. She can work for sports center.

小题3:Swimming club needs teachers to work in the morning.

小题4:Jill likes making friends with old people. He can call MrBrown at 483—0319.

小题5:Old people’s home needs help on Saturday and Sunday.

（6分）某石灰厂新到一批石灰石，其中含有杂质二氧化硅（二氧化硅不溶于水，不与盐酸反应，高温不分解）为测定石灰石样品的纯度，某化学研究性学习小组的同学分成三组实验测得数据如下表：

实验次数	1	2	3
稀盐酸质量（g）	50	50	100
样品质量（g）	20	30	20
产生气体的质量（g）	6.6	6.6	6.6

（1）该实验中第     次稀盐酸和样品恰好完全反应；  

（2）求出该石灰石样品的纯度。

在尼可刹米的化学结构中造成不稳定的官能团是

A．吡啶环
B．酰胺键
C．二乙氨基
D．吡啶环和二乙氨基
E．哌啶环

桑寄生、五加皮除均可祛风湿外，还具有的功效是（）

A.清热安胎

B.利尿消肿

C.定惊止痉

D.温通经络

E.补肝肾，强筋骨

某船的无线电设备电源由二路供电，一路由主配电板供电，另一路由驾驶室的直流低压分电箱供电。请问：该电源是否满足要求，如不满足，指出不满足之处。