Below, a passage is given with ten blanks labelled (A)-(J). Below the passage, five options are given for each blank. Choose the word that fits each blank most appropriately in the context of the passage, and mark the corresponding answer. If the benefits of physical activity are _(A)_, so are the

Below, a passage is given with ten blanks labelled (A)-(J). Below the passage, five options are given for each blank. Choose the word that fits each blank most appropriately in the context of the passage, and mark the corresponding answer.

If the benefits of physical activity are _(A)_, so are the reasons for avoiding it. We've got suggestions for adding some to your day. You already know that exercise is good for you. What you may not know is just how good — or exactly what qualifies as exercise. That's what this issue of the Health Letter is all about. The notion that physical activity helps keep us healthy is very old news indeed. Hippocrates wrote about the dangers of too little activity (and too much food). Tai chi, an exercise system of graceful movements that originated in China, dates from the 12th century B.C. Yoga's roots in India go back much further. But old ideas aren't necessarily good ones or have much evidence to back them up. This isn't a problem for exercise — or physical activity, the term many researchers prefer because it's more of a _(B)_.

A _(C)_ of studies has documented its health benefits. Many are observational, which always pose the problem of showing associations (people who exercise happen to be healthy) not proof of cause and effect (it's the exercise that makes those people healthy). But after statistical adjustments, these studies suggest that the connection between exercise and health is more than just an association. Besides, results from randomized clinical trials, which are usually seen as making the case for causality, also point to exercise making people healthier.

What's impressive about this research, aside from the _(D)_ volume, is the number of conditions exercises seems to prevent, _(E)_, or delay.

We're used to hearing about exercise _(F)_ off heart attacks. The American Heart Association promulgated the country's first set of exercise guidelines in 1972. And it's not hard to envision why exercise helps the heart. If you're physically active, your heart gets trained to beat slower and stronger, so it needs less oxygen to function well; your arteries get springier, so they push your blood along better, and your levels of "good" HDL cholesterol go up.

It's also not much of a surprise that physical activity helps prevent diabetes. Muscles, that are used to working, stay more _(G)_ to insulin - the hormone that ushers blood sugar into cells. So, in fit individuals, blood sugar levels aren't as likely to creep up.

To top things off, moving the body seems to help the brain. Several studies have found that exercise can reduce the symptoms of depression, and it changes the brain in ways similar to antidepressant medications. In old age, physical activity may delay the slide of _(H)_ decline into dementia, and even once that process has started, exercise can improve certain aspects of thinking.

Clearly, some of us are less athletic than others. Twin studies suggest that about half of the difference in physical activity among people is probably inherited. And researchers are making _(I)_ in identifying particular genes that may influence how we respond to physical exertion. For example, they've identified some of the genes responsible for variation in the beta-agonist receptors in the lungs. How your lungs and heart react to strenuous exercise depends, in part, on those receptors.

The types of activities offered to people make a difference. Researchers at San Diego State University reported results in 2008 of a study that offered _(J)_, low-income Latino women aerobic dance classes at storefront exercise sites three times a week. At the end of the six-month study, the dance sessions resulted in a fivefold improvement in their maximal oxygen uptake, an important measure of fitness.

Which of these words appropriately fits the blank labelled (I)?
1). Laurels
2). Impasse
3). Litigation
4). Blunder 

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