希腊化时期的科研倾向不包括（）。A、凭空得出理论 B、凭空捏造经验 C、经验上升为理论D

“诸浮数脉，应当发热，而反______，若有痛处，当发其痈。”

人体内最主要的能源物质是 [ ]

A．脂肪

B．水

C．糖类

D．蛋白质

阅读理解。

     As an aid-fashioned as it sounds, doctors say the best way to lose weight is to eat less and

exercise more. For women who are middle-aged 'or older, experts say an hour of daily exercise

is necessary just to keep weight.

     But for most women, fitting in an hour of exercise in an already busy day is difficult, and it is

even impossible. Especially for many women, most hours are already filled with a full-time job

and raising a family. At the end of the tiring day, at least in the U.S., there is little incentive to

prepare a dinner when fast food is so available--and so much more fattening.

     Nearly twenty million women in the U.S. have the problem of obesity. The United Nations

report notes that America is one of the countries that have the most obese people in the world

and Mississippi has more overweight women than any other state in the U.S.. The U. S. Center

for Disease Control says the number of overweight women increased by 60% between 2004

and 2009 in America. The World Health Organization says more than one billion women in other

nations are in the same shape.

     While there is plenty of advice on how to lose kilograms, a new study is carried out on

middie-aged and older women who keep normal body weight, or BMI (Body Mass Index). "We

found that physical activity was effective in controlling weight only among women who started to gain

weight from a normal BMI ,'I-Min Lee and her colleagues found more exercise did not help.

     "Once a woman is obese, there was no relation between physical activity and weight change

among these women, "Lee said. The researchers say the only way that obese women can lose weight

is to simply cut calories.

1. What makes it difficult for most women to have an hour of exercise every day?

A. Losing confidence in exercising.        

B. Paying all attention to their jobs.

C. Having no interest in exercising.        

D. Being too busy to find spare time.

2. The third paragraph shows us that ______.

A. more and more women are caring about their weight

B. the problem of woman obesity worldwide is serious

C. many organizations are built to care about fat women

D. America has more overweight women than any other country

3. What should an obese woman do to lose weight according to Lee?

A. Eat more vegetables and fruit and less fat.

B. Keep busy all day long and do a lot of exercise.

C. Find a high energy costing and tiring job.

D. Sleep less, eating less and exercising more.

4. From the passage, we know an hour of daily exercise can ______.

A. help people to lose weight          

B. make people put on weight

C. make people keep weight      

D. keep people busy

扁形动物的体壁是由（）和（）构成，它们分别起源于（）胚层和（）胚层，后者又可分为三层。即（）、（）、（）。

机械密封因压盖松动而使密封面移动时可以不更换动、静环。