以下哪个活动是2016领先战役的活动（） A.新知共享-血透中心互访项目 B.CKD

A young man was walking through a supermarket to pick up a few things when he noticed an old lady following him round. Thinking nothing of it, he continued.

Finally, he went to the check-out line, but the old lady got in front of him. "Excuse me," she said, "I’m sorry if my staring at(盯着看) you has made you feel uncomfortable,it’s just because you look like my son, whom I haven’t seen for a long time"

"What a pity," replied the young man, "is there anything I can do for you?"

"Yes," she said, "as I’m leaving, can you say ’Good bye, mother’? It would make me feel so much better."

"Sure," answered the young man. So, when the old woman was leaving, he called out, "Goodbye, mother !"

As he stepped up to the check-out counter(收银台), he saw that his total was $127. 50. "How can that be?" he asked, "I only buy a few things!"

The clerk replied, "Your mother said that you would pay for her. "

小题1:The young man was __ that day.

A. doing some shopping     B. having a walk         C. visiting his mother

小题2:The old lady stood__ the young man on the check-out line.

A.beside         B.behind           C.before

小题3:__ wasn’t an honest person in this story?

A. The clerk          B. The old lady          C. The young man

小题4: At last, what the young man had to pay was __ what he expected.

A. more than          B. less than                 C. as much as

小题5: We know from the story that the old lady__

A. liked shopping       B. had a son             C. paid nothing

在无色透明的未知溶液中加入BaCl₂溶液生成不溶于稀HNO₃的白色沉淀，则未知溶液中可能大量存在（　　）

A．Mg²⁺

B．SO₄^2-

C．CO₃^2-

D．OH^-

如图所示，一固定的楔形木块，其斜面的倾角θ＝30°，另一边与地面垂直，顶上有一定滑轮，一柔软的细绳跨过定滑轮，两端分别与物块A和B连接，A的质量为4m，B的质量为m，开始时将B按在地面上不动，然后放开手，让A沿斜面下滑而B上升，物块A与斜面间无摩擦，若A沿斜面下滑s距离后，细线突然断了。求物块B上升的最大高度H。

变压器铁芯接地电流检测，测试前必须认真检查（）均应正确无误。

A.表计倍率

B.量程

C.零位

D.开始状态

第一次较为系统地论述自然法理论的思想家，提出“社会契约”等命题的是（）。

A.格老秀斯

B.霍布斯

C.孟德斯鸠

D.黑格尔