关于骶骨脊索瘤CT表现的描述，错误的是（）。 A.溶骨性破坏 B.囊实性混杂密度，可

阅读理解。

     I was born in Tuckahoe, Talbot Country, Maryland. I have no accurate (准确的) knowledge of my age,

never having seen any record containing it. By far the larger part of the slaves know as little of their ages as

horses know of theirs, and it is the wish of most masters within my knowledge to keep their slaves thus

ignorant (不知情的). I do not remember having ever met a slave who could tell of his birthday. They seldom

come nearer to it than planting-time, harvesting, springtime, or autumntime. A lack of information concerning

my own was a source of unhappiness to me even during childhood. The white children could tell their ages,

but I could not tell. Why the same right ought to be taken away from me! I was not allowed to ask my master

about it. He considered all such questions on the part of a slave improper and impolite. The nearest estimate

(估计) I can live makes me now between twenty-seven and twenty-eight years of age. I come to this, from

hearing my master say, some time during 1835, I was about seventeen years old. My mother was named

Harriet Bailey. She was the daughter of Isaac and Betsey Bailey, both colored, and quite dark.

     My father was a white man. The opinion was also whispered that my master was my father; but of the

correctness of this opinion, I know nothing and I have no means to know. My mother and I were separated

when I was but an infant-before I knew her as my mother. It is a common custom, in the part of Maryland

from which I ran away, to part children from their mothers at a very early age. Frequently, before the child

has reached its twelfth month, its mother is taken from it,and hired out on some farm a considerable distance

off, and the child is placed under the care of an older woman, too old for field labor.

1. It can be learned from the text that ____. [ ]

A. the slaves forgot the exact time when they were born

B. the writer didn't know whether his master was his father

C. the writer was about twenty-seven years old in 1835

D. the writer's mother left him as soon as he was born

2. The underlined word "it" in Paragraph l refers to ____. [ ]

A. their birthdays

B. my age

C. a record

D. Maryland

3. According to the passage, when the writer was very young his mother ____. [ ]

A. ran away

B. was light-skinned

C. had several children

D. was sent to work elsewhere

4. The author was most probably raised ____. [ ]

A. by his grandparents

B. by an old woman slave

C. with his master's support

D. together with other children

5. How does the writer feel about not knowing his age?  [ ]

A. Curious.

B. Unhappy.

C. Astonished.

D. Ashamed.

滴定邻苯二甲酸氢钾0.5101g，用去NaOH溶液24.60mL，则NaOH溶液的浓度为( )mol/L。

A．0.1208

B．0.1015

C．0.1150

D．0.1304

患者男性，3d前出现对侧上、下肢程度相同的瘫痪、对侧半身感觉障碍、对侧偏盲，失语、失读、失算、失写等，考虑

A．颈内动脉血栓形成
B．大脑中动脉主干血栓形成
C．大脑中动脉深穿支血栓形成
D．大脑中动脉皮质支血栓形成
E．椎基底动脉系统血栓形成

地震损伤中，下列哪一个发生率最高（）？

A.软组织挫伤

B.肝挫裂伤

C.颅内出血

D.骨折