关于肝外伤行诊断性腹腔穿刺的描述中，下列哪一项是不恰当的（） A.闭合性肝损伤出血少

在20世纪90年代后出现的世界上最大的经济共同体，它是[ ]

A．欧洲共同体

B．欧盟

C．亚太经合组织

D．世界贸易组织

照样子，写词语。

例：叽喳：（叽叽喳喳）     

高兴(      )    仔细(      )    

快乐(      )    大小(      )

从1，2，3，4，5这五个数中有放回地取两个数字，则这两个数之积的数学期望为______．

生态系统是一个动态系统，要经过由简单到______的发育过程。

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

16（）

A.moderate

B.hereditary

C.inevitable

D.extreme