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20．
A．Yet
B．Still
C．So
D．But
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Which foods should be eaten to keep us healthy?Let us look at some important vitamins for these answers.Vitamin A helps prevent skin and other tissues from becoming dry.People who do not get enough vitamin A cannot see well in darkness.Vitamin A is found in fish liver oil.It also is in the yellow part of eggs.Sweet potatoes,carrots and other darkly colored fruits and vegetables contain substances that the body can change into vitamin A.Vitamin B-one changes starchy（含淀粉的）foods into energy. It also helps the heart and nervous system work smoothly.Without it,we would be weak and would not grow.Vitamin B-one is found not just in whole grains like brown rice,but also in other foods.These include beans and peas,nuts,and meat and fish.Vitamin B-twelve is needed so folic acid（叶酸）can do its work. Together, they help produce red blood cells.Vitamin B-twelve is found naturally in foods such as eggs,meat,fish and milk products.Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy.Vitamin B-twelve is found in green leafy vegetables and other foods,like legumes and citrus fruits.In some countries,it is added to products like bread.Vitamin C is needed for strong bones and teeth,and for healthy blood passages.It also helps wounds heal quickly.The body stores little vitamin C.So we must get it every day in foods such as citrus（柑橘类）fruits,tomatoes and uncooked cabbage.Vitamin D increases levels of the element calcium in the blood.Calcium is needed for nerve and muscle cells to work normally.It also is needed to build strong bones.Ultraviolet light from the sun changes a substance in the skin into vitamin D.Fish liver oil also contains vitamin D.Vitamin K is needed for healthy blood.It thickens the blood around a cut to stop bleeding. Vitamin K can be found in pork products,liver and in vegetables like cabbage,kale and spinach. In most countries,vitamin B-twelve is added to products like bread.A:Right B:Wrong C:Not mentioned
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--Now that I've finished my exams, I'm going to relax and go to a movie tonight.
--__________ I've still got two finals to take.A.Good luck to you!
B.Lucky you!
C.So far, so good!
D.Mind your own business!
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（2015年）某高架点源排放的SO 2,NO 2源强相等，即Q SO2=Q NOx,仅考虑NO 2/NO x=0.9，下列关于该点源小时浓度预测结果说法正确的是（ ）。A.SO 2,NO 2最大地面浓度相等
B.SO 2最大地面浓度是NO 2的0.9倍
C.SO 2,NO 2最大地面浓度占标率相等
D.SO 2,NO 2最大地面浓度出现距离相等
考题
通过基本6项年评价指标进行判定所在区域达标情况，其中SO2的评价指标正确的是（）。A.SO 2年评价、SO 2 24h平均第96百分位数
B.SO 2年评价、SO 2 24h平均第95百分位数
C.SO 2年评价、SO 2 24h平均第90百分位数
D.SO 2年评价、SO 2 24h平均第98百分位数
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8岁女孩，主因发热2周收入院，查体：T38℃，P100次／分，咽稍充血，心肺（-），双足背见两处结节性红斑，化验血沉100mm/h,AS01257U,PPD（-）。最可能的诊断是
A.过敏性紫癜
B.Still病
C.链球菌感染
D.风湿热
E.结核感染
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It was with great joy __________ Davidreceived the news that his long lost daughter would soon return home.A.as
B.that
C.so
D.for
考题
Leave the reference books behind,___________ you won′t able to think independently.A.or
B.and
C.so
D.but
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