根据下面材料，回答题。

How to Lose Weight Properly

Researchers stress that we need diet and exercise to drop pounds. "The most ____51____ way to lose weight is with a combination," says Rena Wing, head of the National Weight Control Center.

____52____ experts also admit that many ____53____ losers find it helps to ____54____ on one or the other. "A lot of people feel helpless at the thought of ____55____ everything--diet, lifestyle," says Bess Marcus,professor of human behavior. at Brown University Medical School. "So ask yourself, &39; ____56____ do I want to start？ What am I willing to focus on？&39;"

The ____57____ depends on everything from what you hope to ____58____ to how our life is ____59 .____

If you are in a big hurry to drop pounds ____60____, dieting is the way to go. Decades of ____61____ have shown it&39;s the surest and quickest method. If you are more ____62____ with how you look than with numbers on the scale, though, ____63____ may be the way go to. By increasing physical activity, you&39;ll ____64____ fat and build muscle tissue.____65____ often end up losing both fat and muscle tissue.

Your best approach is one that suits your lifestyle. If you&39;ve tried and fail at one approach, consider the other. "A lot of people have so disappointed that they begin to think they&39;ll never be able to lose weight," says Marcus. "That&39;s when it&39;s time to try something new. Even a small step forward can help people regain confidence and convince themselves they can make even bigger changes."

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__________ 查看材料

A.active

B.effective

C.comprehensive

D.productive