下列物质的分类正确的是（ ） ABCD淀粉-混合物苯酚-有机物液氯-非电解质胆矾

How many _________ are there in her mouth?[ ]

A. tooth                 

B. tooths                     

C. teeth 

小数都比1小比0大．______．

— Happy Teachers' Day!

— _____________________[ ]

A. Thank you.

B. OK.

C. Happy Teachers' Day!

关于股骨颈骨折，下列哪项是错误的（）

A.外展嵌插骨折虽属稳定骨折，也会移位，变为不稳定骨折

B.儿童股骨颈骨折也可发生缺血坏死

C.基底型骨折相对难愈合

D.头下型骨折容易发生缺血性坏死

E.股骨颈骨折愈合数年之后，还会发生缺血坏死

An analyst does research about the Z-spread and nominal spread. Assume the Treasury spot-rate yield curve is upward slopping, compared to the nominal yield spread between a Treasury bond and an option-free corporate bond of similar maturity, Z-spread will be:

A. less than the nominal spread.
B. equal to the nominal spread.
C. greater than the nominal spread.