1 . Whenever I hear a recording of John Denver singing “Sunshine on My Shoulders”， I find myself smiling, drawn to a love of the sun and the outdoors I’ve had for years as a Michigan native. Walking barefoot to the lake, playing without shirts in the sunlight, and breathing fresh air feel good. As a doctor I can tell you they are also good for your heart.

Studies have found higher rates of high blood pressure among people with the lowest sun exposure. One reason may be due to nitric oxide (一氧化氮), a gas whose function is activated when your skin is exposed to the sun’s rays. It reduces both heart attack and stroke risks. Vitamin D, which sunlight helps your body produce, is also linked to better health. So walk outdoors for 15 to 30 minutes daily.

In Japan, walking through forests to keep healthy has become a popular practice. Apparently they want to enjoy the fresh air. But research on 280 volunteers found that people had a reduced heart rate, and lower blood pressure when they walked through a forest than when they spent time in an urban area.

One of the consequences of modern society is that rarely is our body in direct contact with the ground. The earth has an electrical current. Direct contact with it may be stabilizing force for good health. Although “earthing” or “grounding” is considered alternative by mainstream medicine, research shows that the practice seems to be able to reduce heart disease risks.

So, walk around barefoot wherever possible, let your backyard grass tickle your feet, and dig your toes into sandy beaches.

1. The first paragraph is meant to ________.

A．show the author likes the song very much

B．put forward the argument of the passage

C．suggest that the author loves nature crazily

D．indicate the author is a Michigan native

2. Sunbathing is good for heart because _______.

A．the sun’s rays make nitric oxide work

B．sunlight can help people keep warm

C．the sun’s rays can help replace vitamin D

D．vitamin D reduces blood circulation

3. It’s believed that walking through forests can ________.

A．make people popular	B．help breathe in fresh air
C．reduce blood pressure	D．help escape noisy cities

4. The best title of the passage should be ________.

A．Nitric Oxide Has Magic Functions

B．Walking Barefoot Builds the Body

C．Sunbathing is Good for Health

D．Outdoor Activities Benefit the Heart

2 . It is quite natural for all of us to want to preserve and protect the foods we purchase. With that in mind,   we often think that the best way to do that is by putting them in our refrigerators. However, that is not always the case.

Bread

Nothing dries out bread faster than your refrigerator. In the event that you have made sandwiches with the bread, then you can place them in the fridge. The cold temperature will make the bread tough and chewy.

Tomato

We all love tomatoes for their taste. But putting them in the refrigerator will cause them to lose all of their flavor (口味). Plus, the cold air in the cooler stops the ripening process as well. And as we all know, ripening is what gives every tomato more taste and flavor. For best results, keep tomatoes out, and inside a basket or a bowl on your counter.

Salad

Oil or vinegar based salad can be stored for a long period of time without refrigeration. Moreover, refrigeration of salad dressings brings bad smell. Keep in mind that some salads that are mayo (蛋黄酱) or yogurt based should be refrigerated in order to keep them fine. So if you have some salads that have been already dressed, you can keep them away from your fridge without any hesitation.

Egg

It is a long debate whether you should keep eggs inside your refrigerator or not. One study suggests that keeping eggs whether in a refrigerator or not does not change their normal qualities, so it can be said that if you keep eggs at room temperature, there should not be any problem. There is another study that shows that keeping eggs inside the refrigerators has a bad effect on the natural taste and flavor of eggs, so it is wise to keep eggs outside of your fridge.

1. Which of the following lose(s) water quickest in the cooler?

A．Bread	B．Tomatoes.
C．Salad.	D．Eggs.

2. What should we do with tomatoes to get the best taste?

A．Put them in the cooler.	B．Cook them at once.
C．Make them ripen faster.	D．Leave them in the shade.

3. What will go bad easily without refrigeration?

A．Dressed salad.	B．Mayo and yogurt.
C．Oil and vinegar.	D．Salad dressings.