Generations of Americans have been brought up to believe that a good breakfast is essential to one's life. Eating breakfast at the start of the day, we have been told, and told again, is as necessary as putting gasoline in the family car before starting a trip.
But for many people, the thought of food as the first thing in the morning is never a pleasure. So in spite of all the efforts, they still take no breakfast. Between 1977 and 1983, the latest year for which figures could be obtained, the number of people who didn’t have breakfast increased by 33%—from 8.8 million to 11.7 million—according to the Chicago-based Market Research Corporation of America.
For those who dislike eating breakfast, however, there is some good news. Several studies in the last few years have shown that, for grown-ups especially, there may be nothing wrong with omitting breakfast. “Going without breakfast does not affect work,” said Arnold E. Bender, former professor of nutrition at Queen Elizabeth College in London, “nor does giving people breakfast improve work.”
Scientific evidence linking breakfast to better health or better work is surprisingly inadequate, and most of the recent work involves children, not grown-ups. “The literature,” says one researcher, Dr Earnest Polite at the University of Texas, “is poor.”
小题1:The main idea of the passage is that _______.
A．breakfast has nothing to do with people's health
B．a good breakfast used to be important to us
C．breakfast is not as important to us as gasoline to a car
D．breakfast is not as important as we thought before小题2:For those who do not take breakfast, the good news is that _______.
A．several studies have been done in the past few years
B．the omission of breakfast has little effect on one’s work
C．grown-ups have especially made studies in this field
D．eating little in the morning is good for health小题3:The underlined part “nor does giving people breakfast improve work” means _______.
A．people without breakfast can improve their work
B．not giving people breakfast improves work
C．having breakfast does not improve work, either
D．people having breakfast do improve their work, too小题4:The word "literature" in the last sentence refers to _______.
A．stories, poems, play, etc
B．written works on a particular subject
C．newspaper articles
D．the modern literature of America小题5:What is implied but not stated by the author is that _______.
A．breakfast does not affect work
B．Dr Polite works at an institution of higher learning
C．not eating breakfast might affect the health of children
D．Professor Bender once taught college courses in nutrition in London
H+ + CrO2—+ H2O；（3）3.0×10－6；
4NO+6H2O；
H++CrO2-+H2O；（3）电解后溶液中c（Fe3+）=2.0×10-13mol/L，则溶液中c3（OH-）=4×10−38/2.0×10－13 =2×10-25，故溶液中c（Cr3+）=6.0×l0-31/2×10-25 =3×10-6mol/L；Ⅱ、C溶液与葡萄糖在加热条件下生成金属D，则D为Ag、C为银氨溶液，气体A与溶液B得到银氨溶液，则A为NH3、B为AgNO3，Ag与溶液H反应得到硝酸银与气体F，则H为HNO3，逆推可知G为NO2，F为NO，E为O2。（1）A为NH3，所含化学键均为极性键，空间构型为三角锥形，属于极性分子； C溶液中的阳离子为[Ag(NH3)2]+；（2）反应①的化学方程式为4NH3+5O2
4NO+6H2O；反应③的离子方程式为3Ag+4H++NO3-=3Ag++NO↑+2H2O。sP的计算、物质的推断及化学方程式的书写。