血清中天然凝集素和冷凝集素的抗体类型是（） A.IgG B.IgA C.IgM D.

--- Pass the newspaper to me, dear.     

--- There is       in it. You’d better watch TV.

A．something interesting

B．anything new

C．an important thing

D．nothing special

Questions 9-13

·You will hear the customs infive countries.
·For questions 9-13, choose from the list A-F the proper countries.
·Use the letters only once. There is one extra letter which you do not need to use.
9. Country 1:______
10. Country 2:______
11. Country 3:______
12. Country 4:______
13. Country 5:______

• A. Australia
• B. Spain
• C. China
• D. Rome
• E. Britain
• F. Greece

有两台测温仪表，其测量范围分别是0～800℃和600～1100℃，已知其最大绝对误差均为±6℃，试分别确定它们的精度等级．

北京大学的第一任校长是谁？（）

A、蔡元培

B、马寅初

C、严复

D、孙家鼐

一项重大投资活动可能因决策错误或因遇到不测事件而使投资者蒙受灾难性的损失，如决策正确，则有可能给投资人带来巨额利润，这是一种( )。

A．纯风险

B．投机风险

C．客观风险

D．行业风险