下列物态变化中，属于放热过程的是（ ） A．熔化 B．凝华 C．汽化 D．升华

Years ago, when I started looking for my first job, wise advisers advised," Barbara, be enthusiastic (热情的) ! Enthusiasm will take you further than any amount of experience. "How right they were!

"Nothing great was ever achieved without enthusiasm." wrote Ralph Waldo Emerson. It isthe paste that helps you hang on there, then the going gets tough. It is the inner voice that whispers, "I can do it!" When others shout, "No, you can't!" It took years and years for the early work of Barbara McClintock, a geneticist who won the 1983 Nobel Prize in medicine, to be generally accepted, yet she didn't stop working on her experiments. Work was such a deep pleasure for her that she never thought of stopping.

We are all born with wide-eyed, enthusiastic wonder and it is this childlike wonder that gives enthusiastic people such youthful air, whatever their age. At 90, Cellist Pablo Casals would start his day by playing Bach. As the music flowed through his fingers, his stooped shoulders would straighten and joy would reappear in his eyes. An author and poet Samuel Ulman once wrote," Years wrinkle the skin, but to give up enthusiasm wrinkles the soul. "

Enthusiastic people also love what they do, regardless of money or title or power. Patricia Mellrath, retired director of the Missouri Repertory Theater in Kansas City, was once asked where she got her enthusiasm. She replied, "My father, a lawyer, long ago told me, 'I never made a dime until I stopped working for money.' "

If we can't do what we love as a full-time career, we can as a hobby. Elizabeth Layton of Wellsville Kan, was 68 before she began to draw. This activity ended periods of depression that had troubled her for at least 30 years, and the quality of her work led one critic to say, "I am tempted to call Layton a genius. "

We need to turn the tears into sweat as we go after "what-can-be". We need to live each moment whole-heartedly, with all our senses--finding pleasure in the sweet smell of a back-yard garden, the simple picture of a six-year-old, the beauty of a rainbow.

72. Which of the following would be the best title for the test?

A. Enthusiastic people will never get old.

B. Enthusiasm can make you succeed and enjoy life.

C. Enthusiasm is more important than experience.

D. Enthusiasm can give people more success and fame.

73. Which of the following can best explain the underlined sentence in the second paragraph?

A. Enthusiasm can give you courage and strength in difficult times.

B. If you don't have enthusiasm, you can achieve nothing.

C. Enthusiastic people never consider money and fame.

D. Enthusiastic people can gain great fame and honour.

74. The author mentions Cellist Pablo Casals in the third paragraph to show that _______.

A. music can arouse people’s enthusiasm

B. enthusiasm can give people needed inspiration to succeed

C. enthusiasm can make people feel young

D. enthusiasm can keep people healthy

75. How many examples are given in the passage to show the importance of enthusiasm?

A. Three.            B. Two.              C. Four.             D. Five.

矿物能源是现代人类社会赖以生存的重要物质基础。目前世界矿物能源仍以化石燃料煤、石油、天然气为主。

（1）试以C、C_nH_2n+2、CH₄为代表，写出其完全燃烧的化学方程式：

_____________________、_____________________、_____________________。

等质量的上述三种燃料完全燃烧，对环境的负面影响最小的是_____________________。

（2）化石燃料储存的能量来自绿色植物吸收的太阳能，光合作用把太阳能转化成___________能，生成糖（以葡萄糖C₆H₁₂O₆为代表），则光合作用的总反应式为_____________________。

（3）光合作用释放的O₂来自于参加反应的哪种物质？

急性支气管炎病人应尽量避免食用的食品是（）。

A.胡萝卜

B.米糊

C.豆浆

D.奶制品

E.蛋羹

不属于口腔念珠菌病常见的临床症状为（）

A.口干

B.烧灼感

C.疼痛

D.溃疡

E.味觉减退

对青春期的学生进行性教育辅导的态度是（）。

A.无条件的尊重和接纳

B.对早恋现象不要过于敏感，不要粗暴对待

C.理解但不姑息青春期早恋

D.分清"恋情’和“友情”