成本动因是指（）。A、企业成本的一种类型 B、企业成本中的可变成本 C、影响企业利润

女孩，5岁半，1个月来精神欠佳，食欲减退，体重下降伴咳嗽。体检：一般情况尚好，颈部可扪及多个1cm大小淋巴结，质硬，压痛，心肺听诊无好转，肝脾未扪及，PPD（-）。胸部X片检查，肺门淋巴结肿大，血沉60mm/h。

此患儿PPD（-），推测可能原因是（）

A.PPD试剂失效

B.初次感染结核菌尚未出现变态反应

C.使用PPD浓度太低

D.变态反应受到暂时抑制

E.此患儿可能不是结核，考虑肺炎

两个大样本均数比较的u检验，|u|＝1.98，则统计结论是

A．P＜0.05

B．P＜0.0l

C．P＞0.05

D．P＝0.05

E．无法判断

渗透系数的数值等于水力梯度为1时，地下水的渗透()，颗粒越粗的土，渗透系数数值越()。

请阅读下列的广告：

A．       Guangzhou Sports Ground

Open next week from 6:20 to 8:30 pm.

Admission: $2, under 45 or over 60 -- $7.

Welcome to join us to keep you fit.

Tel: 23455884

B.         CCTV-1

The programs are as follow: 18:30 Sports, 19:00 World News, 19:30 Introduction of Museum of Modern Art, 21:30 Movie – DANCE IN THE RAIN

C.         Dongfeng Photo Shop

Photos for all purposes are taken with half of the price for new husband and wife.

Mon --- Frid.: 8:30 am --- 8:30 pm, Sat. & Sun.: 9:00 am --- 10:00 pm

D.         STAMPS ON SHOW

Time: 8:30am --- 5:00 pm. on October 23—24

Add: No. 1 Yuejin Road, Guangzhou

E.         PART-TIME JOB OFFERED

Do you want to have a chance to communicate with those who do shopping? If so, you may contact with Sunny Bookshop, for two shop assistants are needed here.

Tel: 020-23100013

F.         HELP FROM MUSIC TEACHER

Violin lessons to be given at 8:00 on Monday evening. Those attending prepare violins by themselves.

Admission: 100 yuan (half price for students)

Tel: 020-28338381

请阅读以下人员的相关信息，然后匹配和他/她感兴趣的广告。

小题1:Meimei is interested in playing the violin, but she can’t play very well because she has no music teacher to teach her face to face. She really wants to get one.

小题2:Peter begins to have his summer holiday today. He is too tired to go out for any activity. Instead, he would like to stay home in the evening.

小题3:Tom’s family is not rich. He wants to find a part-time job at weekends to earn some money for his study.

小题4:Jany is too fat. This is not good to her health. She knows it well and want to take more exercise after study.

小题5:Liu Hua is going to marry next month. Before that, she is going to take photos with her new husband.

下列（）不属于可以中止行使不安抗辩权的情形。

A.经营状况恶化

B.转移财产、抽逃资金，以逃避债务

C.丧失商业信誉

D.丧失偿债能力