硝酸还原酶分子中含有：（）

A:FAD和Mn B:FMN和Mo C:FAD和Mo

在呼吸链中既可传递电子又可传递质子的组分是（）组。

A:NAD、FAD和Cytb（） B:NAD、FAD和CoQ C:Cytb、FAD和CoQ（） D:Fe-S、Cytaa3和Cytb

在呼吸链中只能传递电子的组分是（）组。

A:NAD、FAD和Cytb（） B:NAD、FAD和CoQ C:Cytb、FAD和CoQ（） D:Fe-S、Cytaa3和Cytb

FAD

命题“若α＝，则tan α＝1”的逆否命题是（ ）

A:若α≠，则tan α≠1 B:若α＝，则tan α≠1 C:若tan α≠1，则α＝ D:若tan α≠1，则α≠

A.fad diet is a diet that suddenly becomes popular, usually because it promises people that they will lose a lot of weight overnight. Although dieters may really show weight loss from a fad diet, they will almost certainly get back the weight if their usual eating habits (习惯) remain unchangeD.Moreover, fad diets continuously call for special products of questionable value or for

“health foods” “health foods” that may cost twice as much as supermarket(超市) foods. Worse yet, certain fad diets don't include nutrients(营养)good for health. People have been known to become very ill as a result of following medically unhealthy diets.

The worse fact of fad diets, though, is that they keep people who are over-weight or sick from receiving the medical care that they truly neeD.

21. The word “fad” in the first sentence means ______.

A. new B. wonderful C. popular quickly D. loved by people

22.In the writer’s opinion，fad diets________.

A.are very helpfulB.are not healthy diet

C.won’t cost muchD.include lots of nutrients

23. The last paragraph tells us ______.

A. that fad dieters are often overweight

B. fad dieters need medical care if they are overweight or sick

C. how fad dieters get sick

D. overweight or sick fad dieter can’t get medical care in time

A fad diet is a diet that suddenly becomes popular, usually because it promises people that they will lose a lot of weight overnight. Although dieters may really show weight loss from a fad diet, they will almost certainly get back the weight if their usual eating habits (习惯) remain unchangeD. Moreover, fad diets continuously call for special products of questionable value or for “health foods” that may cost twice as much as supermarket(超市) foods. Worse yet, certain fad diets don't include nutrients(营养)good for health. People have been known to become very ill as a result of following medically unhealthy diets.

The worse fact of fad diets, though, is that they keep people who are over-weight or sick from receiving the medical care that they truly neeD.

56. The word “fad” in the first sentence means ______.

A. new B. wonderful C. popular quickly D. loved by people

57. From the text we know that ______.

A. people refuse to accept fad diets

B. fad diets can help people to lose weight

C. a man can lose weight after eating a fad diet

D. fad diets are now welcomed by people

58. In the writer's opinion, fad diets______.

A. are very helpful B. are not healthy diet

C. won't cost much D. include lots of nutrients

59.A.fad dieter has to ______.

A. spend more money B. lose much weight

C. keep his usual eating habits D. go to doctors very often

60. The last paragraph tells us ______.

A. that fad dieters are often overweight

B. fad dieters need medical care if they are overweight or sick

C. how fad dieters get sick

D. overweight or sick fad dieter can’t get medical care in time

CDBAD    

A fad diet is a diet that suddenly becomes popular，usually because it promises people that they will lose a lot of weight overnight.Although dieters may really show weight loss from a fad diet，they will almost certainly get back the weight if their usual eating habits (习惯) remain unchangeD.Moreover，fad diets continuously call for special products of questionable value or for “health foods” that may cost twice as much as supermarket foods.Worse yet，certain fad diets don’t include nutrients (营养) good for health.People have been known to become very ill as a result of following medically unhealthy diets.

The worse fact of fad diets，though，is that they keep people who are over­weight or sick from receiving the medical care that they truly neeD.

60.The word “fad” in the first sentence means________.

A.newB.wonderful

C.popular quicklyD.loved by people

61.In the writer’s opinion，fad diets________.

A.are very helpfulB.are not healthy diet

C.won’t cost muchD.include lots of nutrients

62.A fad dieter has to________.

A.spend more moneyB.lose much weight

C.keep his usual eating habitsD.go to doctors very often

63.The last paragraph tells us________.

A.that fad dieters are often overweight

B.how fad dieters get sick

C.fad dieters need medical care if they are overweight or sick

D.overweight or sick fad dieter can’t get medical care easily

60.C　第一句解释了fad diet的意思。

61.B　作者写这篇短文的目的是向读者分析a fad diet的真实情况。

62.A　根据“cost twice as much as supermarket foods”可知。

63.D　fad diet使得需要医疗护理的过度胖人或病人不去看病而依靠fad diet。

A fad diet is a diet that suddenly becomes popular, usually because it promises people that they will lose a lot of weight overnight. Although dieters may really show weight loss from a fad diet, they will almost certainly get back the weight if their usual eating habits (习惯) remain unchangeD. Moreover, fad diets continuously call for special products of questionable value or for “health foods” that may cost twice as much as supermarket(超市) foods. Worse yet, certain fad diets don't include nutrients(营养)good for health. People have been known to become very ill as a result of following medically unhealthy diets.

The worse fact of fad diets, though, is that they keep people who are over-weight or sick from receiving the medical care that they truly neeD.

1. The word “fad” in the first sentence means ______.

A. new B. wonderful C. popular quickly D. loved by people

2. From the text we know that ______.

A. people refuse to accept fad diets B. fad diets can help people to lose weight

C. a man can lose weight after eating a fad diet D. fad diets are now welcomed by people

3. In the writer's opinion, fad diets______.

A. are very helpful B. are not healthy diet C. won't cost much D. include lots of nutrients

4.A.fad dieter has to ______.

A. spend more money B. lose much weight C. keep his usual eating habits D. go to doctors very often

5. The last paragraph tells us ______.

A. that fad dieters are often overweight

B. fad dieters need medical care if they are overweight or sick

C. how fad dieters get sick

D. overweight or sick fad dieter can’t get medical care in time

CDBAD

鉴别甲烷、一氧化碳和氢气等三种无色气体的方法是：

A:通入溴水通入澄清石灰水 B:点燃罩上涂有澄清石灰水的烧杯 C:点燃罩上干冷烧杯罩上涂有澄清石灰水的烧杯 D:点燃罩上涂有澄清石灰水的烧杯通入溴水