有的母猪产前不吃料，体温不高，原因是什么？如何治疗？

如图所示，容器竖管横截面面积A₁=1cm²，底面面积A₂=100cm²，水对容器底面的作用力为（）N。

A．1.95

B．9.8

C．24.5

D．98.0

《中华民国临时约法》规定：“中华民国之主权属于国民全体。”对此理解正确的是

①中华民国属于真正的人民民主共和国    ②它体现了西方民主思想    

③其实际意义主要在于否定了君主专制制度  ④标志中国确立了三权分立的民主共和政体 [     ]

A．①②        

B．②③      

C．②④          

D．③④

关于晨昏线与经线圈的叙述，正确的是

A．除二至日外，均能重合

B．每天都重合一次

C．只有二分日才能重合

D．任何时候都不重合

There is no light on , they ____ be at home.   [ ]

A. need't          

B. shouldn't

C. can't          

D. mustn't

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用

括号中词语的正确形式填空，并将答案填写在标号为1-10的相应位置上。

     Dr Wayne W. Dyer (called the "father of motivation" by his fans) wrote, "There is no way to happiness.

Happiness is the way." There is no use 1.______ (say) "Some day 2.______ I achieve these goals, get this

car, build this house, and have this business, I will be really happy." Life doesn't work that way. If you wait

for certain things 3.______ (happen) and depend on life to make you happy, you will always feel unfulfilled. 

4.______ will always be something missing. Long-term happiness is based 5.______ honesty, self-esteem,

productive work, and making other people happy.

     Long-term happiness is 6.______ process of moving towards worthwhile goals and adding to the welfare

and happiness of others. It means reaching your goals and then challenging yourself to higher and 7.______

(good) things. It 8.______ means always trying to learn and grow. Work 9.______ (honest) and productively,

and contribute real values to others. In the long run, that's 10.______ happiness is about.