背部疼痛可发生于()A．胰腺癌 B．球后溃疡 C．穿透性溃疡 D．幽门梗阻 E．胃食

阅读理解。

     One day an old man is selling(卖) a big elephant. A young man comes to the elephant and begins to

look at it slowly. The old man goes up to him and says in his ear," Don't say anything about the elephant

before I sell it.  Then I will give you twenty dollars. "  "All right,"  says the young man. After the old man

sells  the  elephant,   he gives the young man twenty  dollars  and says,  "Now, can you tell me how you

found the  elephant's  bad ears?"  "I didn't find the bad  ears,"  says the young man.  "Then why are you

looking at the elephant slowly?" asks the old man. The young man answers, "Because I have never seen

an elephant before, and I want to know what it looks like. "

l.         the elephant.

A.The young man sells

B. The old man sells

C. Two men sell

D. The old man buys  

2. The young man is looking at the elephant slowly. He wants to find out          .      

A. which foot of the elephant is bad

B. how heavy it is

C. which ear of the elephant is bad

D. what it looks like    

3. The young man              .      

A. knows the elephant has bad ears

B. wants to buy the elephant

C.looks after the elephant

D. gets some money from the old man   

4. The young man                .      

A.is not interested in elephants

B. knows what an elephant looks like

C. has seen some elephants before      

D. has never seen an elephant before 

5. Hearing what the young man said, the old man will  probably (很可能) be  _          .      

A. angry              

B. happy

C. dangerous          

D. hungry

一年轻已婚女性。术中见左侧卵巢肿瘤拳头大小，包膜完整，实质性，左侧卵巢剖视正常，腹腔冲洗液中未发现肿瘤细胞。冷冻切片示左卵巢颗粒细胞瘤。处理宜为( )

A．子宫全切除术+双附件切除术

B．左侧附件切除术，术后密切随访

C．左侧肿瘤切除术+子宫切除术，术后密切随访

D．左侧附件切除术+大网膜切除术

E．子宫全切除术+左侧附件切除术，术后化疗

在Cu0和铁粉的混合物中加入一定量的稀H₂S0₄，反应完全后滤出不溶物，再向滤液中加入一薄铁片，足够时间后，铁片上无任何变化．据此，你认为下列结论不正确的是（　　）

A．滤出的不溶物中有铜，也可能有铁

B．如果滤出的不溶物中有铁，则一定有铜

C．滤出的不溶物中一定有铜，但不可能有铁

D．滤液中一定含有FeS0₄，不可能含有CuS0₄和H₂S0₄

水轮发电机导轴承的作用是什么？

试述颅底不同部位损伤可能出现的主要症状及其解剖学基础。