差别定价，又称价格歧视，是指企业按照两种或两种以上不反映成本费用的比例差异的价格销售

根据中文意思完成下列句子（每小题1分, 满分10分）。

小题1:I ________ painting or drawing________ _________(发现……非常令人放松), but it is very stressful to wait for exam results.

小题2:Usually, it’s ____ ________ _______(如此拥挤以至于)I can’t find anywhere to sit.

小题3:They have already expressed a keen interest in working in design after their tennis careers_______ _______ _______ _______(结束).

小题4:On this day, the moon______ ________ _______ ______(据说是) its biggest and brightest.

小题5:In 1983, there are only 200 computers__________ _____ ______ ___________(与因特网连接).

小题6:With the progress of new medical research, ______ ____________ _______(我有信心) people like me would be able to walk again one day.

小题7:The famous classical pianist surprised his fans last week by giving a concert ____________classical music _______(把……与……相结合)Chinese folk music.

小题8:They______ _________ ______(穿着) beautiful costumes, skipping back and forth to the rhythm of loud drums.

小题9:This was the house Papa talked about when he_________ ______(梦想) being rich.

小题10:In the painting, a young woman sits alone and____ ______ ______ _________(陷入沉思).

我国为了改善日趋恶化的生态环境，建设了许多防护林体系，其中规模较大的是“三北”防护林和长江中上游防护林。回答题：

小题1:“三北”防护林所起的主要的环保功效是（   ）

A．净化空气

B．美化环境

C．涵养水源

D．防风固沙小题2:长江中上游防护林所起的生态作用是（    ）

A．涵养水源、保持水土

B．繁衍物种、维护生物多样性

C．调节气候、稳定大气成分

D．净化空气、吸烟除尘

方差分析中计算得到的F值（）

A.一定小于0

B.一定小于1

C.一定等于0

D.可以为负值

E.一定为正值

员工招聘是一项应聘者与工作岗位之间进行相互匹配的活动。

某工程项目工期为12个月，其中合同价款中安全防护、文明施工措施费用为100万元。在合同没有约定或约定不明愦况下，建设单位预付该部分费用最低应为（）万元。

A．10

B．20

C．30

D．50