医疗机构从业人员既要遵守本文件所列（）规范又要遵守与（）相对应的分类行为规范。（）

钢球在很深的油槽中由静止开始下落，若油对球的阻力正比于钢球运动的速率，则钢球在接触油槽底部之前的运动是（　　）

A．先加速后匀速

B．一直在做匀加速运动

C．先加速后减速最后静止

D．先加速后减速直至匀速

  Art is for everyone. Parents can help kids appreciate art by making it available for them. Unfortunately, many adults do not enjoy art simply because they do not understand the stories or context (背景). Actually, children can appreciate art as well as any adult. Here are some simple ways to encourage children to appreciate art.

Find art that will allow children to easily make a connection with their lives. Choose the material according to their ages. Pictures and sculptures of children, for example, or dogs and cats are easily understood, and it is easy to start a conversation about how the themes in the art are connected with familiar people and animals in kids’ lives. Music and dance are very important to children and should also be used.

Explore the stories behind famous, and not so famous, art. Encourage children to make up their own stories about paintings and then research the real story behind the paintings.

Create art with children. Teach them that art is not something that they must only observe but something that they can create. Discuss art with children. Encourage them to express their views on art. Let them know that it is okay to dislike something, and listen to their preferences when planning events.

Visit museums and performances. Explore the artwork in local museums that will interest them. Most cities have children’s theaters and music groups, and often free performances are offered. Many art museums have special tours for children.

Through a variety of artistic experiences, kids will learn how to appreciate art and will enjoy it.

64. When choosing art for children, parents should________.      

A. take their children’s ages and experiences into consideration

B. pay close attention to their children’s ability to understand

C. ask professional artists for some useful advice

D. try to find some art beyond their imagination

65. Which of the following should not be down in creating art with children?

A. Allowing children to speak out their own opinions on art. 

B. Allowing children to have their own likes and dislikes.

C. Making children interested in everything about art.

D. Talking with children about something on art.

66. We can learn from the text that helping children appreciate art_________.

A. is highly necessary for their growth 

B. will improve their school performance

C. can help them make more friends at school 

D. needs parents’ encouragement and instruction

不稳定细胞

承兑的作用在于确定付款人对汇票金额的付款义务，如果付款人拒绝承兑，（）。

A.持票人可以对他起诉

B.持票人不能对他起诉

C.持票人可以对背书人进行追索

D.持票人可以对出票人进行追索

普通螺纹的牙型角为60°。( )