已知定义在（-1，1）上的函数f（x）=x-sinx，若f（a-2）+f（4-a

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Dear John,

Last summer I take a parttime job in the International                                  1.       

Camp for children.I have been told one more worker                                           2.       

will be needed this year and I think you are fit it.How                                 3.       

about join us?The camp is at the foot of a small hill                                     4.       

close to a river.It is so a beautiful place!We can hear                                           5.       

birds singing happy all around.Everybody sleeps in                                       6.       

tents,that is very exciting.We usually work only five                                     7.       

hours a day,so we will have plenty of spare time visit the                                    8.       

area and have a fun.I am sure it will be an unforgettable                                9.       

experience.If you have interests in it,reply to me soon.                                  10.       

Yours,

Li Ping

下列哪项不属于水代谢途径( )

A．尿

B．无形失水

C．内生水

D．细胞内、外液的平衡

E．伤口渗液

气体保护焊适宜于全位置焊接。

心源性哮喘宜选用（）

A.肾上腺素

B.去甲肾上腺素

C.异丙肾上腺素

D.哌替啶

E.多巴胺

取前伸颌位关系记录是为了确定（）

A.切导斜度

B.牙尖斜度

C.髁导斜度

D.定位平面斜度

E.补偿曲线曲度