圆的对称轴是它的______，圆有______条对称轴．

光缆弯曲半径：光缆不小于其外径的（）倍。

A、5

B、7.5

C、15

D、20

Reading comprehension.

     John and Bobby joined a wholesale company together just after graduation from college the same Year.

Both worked very hard. After several years, however, the boss promoted Bobby to the position of manager

but John remained an ordinary employee. John could not take it any more, tendered his resignation to the

boss and complained the boss did not know how to delegate and did not value hard-working staff, but only

promoted those who flattered him.

     The boss knew that John worked very hard for the years. He thought a moment and said, "Thank you

for your criticism, but I have a request. I hope you will do one more thing for our company before you leave

Perhaps you will change your decision and take back your resignation."

     John agreed. The boss asked him to go and find out anyone selling watermelon in the market. John went

and returned soon. He said he had found out a man selling watermelon. The boss asked how much per kg.

John shook his head and went back to the market to ask and returned to inform the boss $1.2 per kg.

     Boss told John to wait a second, and he called Bobby to come to his office. He asked Bobby to go and

find anyone selling watermelon in the market. Bobby went, returned and said, "Boss, only one person selling

watermelon. $1.2 per kg, $10 for 10 kg, he has inventory (清单) of 340 melons. On the table 58 melons,

bought from the South two days ago, they are fresh and red, good quality."

     John was very impressed and realized the difference between himself and Bobby. He decided not to resign

but to learn from Bobby.

     Chances exist in the daily details. For the same matter, a more successful person sees more and farther so

that he can find out an opportunity and catch it to realize his aim. If a person sees one year ahead, while another

sees only tomorrow. Then the difference between a year and a day is 365 times!

1. Why did John decide to hand in his resignation to the boss?

A. Because he couldn't stand being an ordinary employee.

B. Because Bobby would take John's former position.

C. Because the boss was not flattered by his hard work.

D. Because Bobby instead of him was promoted.

2. What did the boss ask John to do?

A. To go to market and find out whether there is someone selling watermelons.

B. To make a complete marketing research on the various prices of watermelons.

C. To search for much information about the effective ways to sell watermelons.

D. To make a comparison on the prices of different types of watermelons.

3. What sort of following information about watermelons was NOT brought by Bobby?

A. The price.

B. The quality.

C. The quantity.

D. The weight.

4. From the difference of John and Bobby, we may infer that a more successful person is more _____.

A. alert, sensitive and passionate

B. observant, thoughtful and exploratory

C. considerate, modest and satisfied

D. confident, noble and tolerant

患者男性62岁，牙列缺失，行全口义齿修复，口腔检查发现该患者颌位关系异常

若患者下颌弓略宽于上颌弓后牙排牙方法错误的是（）

A.尽可能排成正常的覆，覆盖关系

B.上颌可适当排向颊侧

C.下颌可略排向舌侧

D.可适当加大横曲线曲度

E.最好选用解剖式牙

“一文钱的不义之财就可以让人的肌体与灵魂一寸一寸地产生病变，直至腐败”。这句人生警句是从“腐败”二字拆解为“广（病）人、寸、肉（肌体、灵魂）、贝、文”六个偏旁部首后重新组合起来的。下列古语与这句人生警句蕴涵的哲理相一致的是（）

A.从天而颂之，孰与制天命而用之————《荀子》

B.泾溪石险未覆舟，平流无石却沉沦————《泾溪》

C.其为政也，善因祸而得福，转败而为功————《史记》

D.善不积不足以成名，恶不积不足以灭身————《周易》

使废气锅炉排气进口温度t₁（），可回收的排气余热就越（）。

A.提得越高/多

B.提得越高/少

C.降得越低/多

D.降得越低/少