如图所示，物体A在光滑的斜面上沿斜面下滑，则A受到的作用力是( )
A．重力、弹力和下滑力
B．重力和弹力
C．重力和下滑力
D．重力、压力和下滑力
答案：B
V. 单词拼写
64. They have ___________(成功) in keeping this animal from becoming endangered.
65. At last the _________(狼) were killed by the hunters.
66. Today’s American culture ___________(包含)many different musical styles.
67. Beckham is a ___________(有名的)football player who has fans throughout the world.
68. The child apologized to his friends _____________(真诚地).
工程量清单编制的原则有( )。
A．遵守有关法律法规
B．遵守招标文件的相关要求
C．针对企业定额的规定计算工程量
D．按统一的工程量计算规则计算工程量
E．按国家统一的项目划分标准进行项目的划分
