问题 选择题

2010年冬奥会在温哥华举行。奥运会上发令枪所用“火药”的主要成分是氯酸钾和红磷,撞击时发生的化学反应为:5KC1O3+6P =3P2O5+5KC1。下列有关该反应的叙述中,正确的是(  )

A.氯酸钾是还原剂

B.反应中消耗3molP时,转移电子的物质的量为15mol

C.KCl既是氧化产物,又是还原产物

D.发令时产生的白烟只是KC1固体颗粒

答案

答案:B

阅读理解

阅读理解

                                                        You are what you eat

     Keeping better eating habits can help you reduce (减少) disease. A healthy eating plan means

choosing the right foods to eat and preparing foods in a healthy way.

                                                   _______________________

     Do you often change your toothbrush? Maybe you think it is not necessary. A study shows old

toothbrushes bring disease. You should often change your toothbrush.

                                                                  Exercise

     Swimming, running, skating, skiing, dancing, walking and some other activities can help you stay

healthy. You should exercise at least three times a week and for twenty minutes or more each time. Do it.

                                                          Plan out your life

     You should have breakfast before you go to school. Have a proper (合适的) meal for lunch. Follow

a healthy diet.

1.What's the passage mainly about?

A.Healthy food.

B.Healthy lifestyle (生活方式).

C.Junk food.

D.Healthy sports.

2.What is the best title (标题) for the second paragraph?

A.Man's disease

B.Disease

C.Watch the toothbrush

D.Your bathroom

3.At least how long should you exercise each time?

A.Twenty minutes.

B.Fifteen minutes.

C.Five minutes.

D.Ten minutes.

4.From the passage, we know _______ can help us stay healthy.

A.proper diet

B.exercise

C.sleep and exercise

D.proper diet and exercise

5.What does a healthy eating plan mean?

A.Choosing the right foods.

B.Cooking the foods in a healthy way.

C.Never eat meat or fresh vegetables.

D.Both A and B.

单项选择题