骨关节炎的原发病变是 A．透明软骨退行性变 B．骨赘形成 C．非特异性滑膜炎 D．关

At the weekend I often go to the bookshop ________ new books.

A．look at

B．to have a look at

C．look for

D．to look on

“Susan, go and join your sister cleaning the yard.” “Why ______? John is sitting there doing nothing.”

A．him

B．he

C．I

D．me

小儿急性肾炎严重循环充血，不包括

A．心搏出量下降

B．静脉压增高

C．心脏扩大

D．肝增大

E．心率增快

乳牙面洞深度（）

A.牙釉质内lmm

B.洞深1~1.5mm

C.牙本质内

D.釉牙本质界处

E.与龋坏最深处一致

移动通信按使用环境可分为陆地通信和空中通信。