15．"Anytime you are in the outdoors，especially around snow，water or rocks，there′s going to be lots of glare and reflection，"Brad Ludden says．"Since I spend 90 percent of my life outdoors，I am at risk of eye problems．That′s why I wear sunglasses whenever I can．"
Whether you wear shades to protect your eyes or simply to look like a rock star，here′s the good news：Sunglasses can be functional and cool-without you spending too much money．You just have to be a smart sunglasses shopper．Here′s how．
Where to Shop：
"Never shop for shades on a street corner，"Ludden says．Sunglass-specific shops or outdoor stores usually have knowledgeable staff，and you don′t have to worry about buying shoddy sunglasses．
Plan to spend at least﹩30 to get a quality pair of sunglasses．Cheaper shades are likely to be of questionable quality．But don't overdo it，either；over﹩100，you are probably just paying for a trendy brand name．
Sport-Specific：
Before you go shopping，consider what you will be using your shades for．Look at your hobbies．Are you around the water a lot？Do you love to ski or hike in the snow？Is cycling your thing？"Figure out what you want before you go in the store，"Ludden says．"Then have them show you a few that match your criteria and fit your face the best．"
The Lens Matters：
For most outdoor sports，shatterproof polycarbonate lenses （防碎的聚碳酸酯纖維鏡片） are best．Glass lenses are recommended only for activities like fishing．
Also，make sure the lens provides 100 percent protection from the sun′s harmful rays．"If you buy glasses with cheap lenses they can give you headaches，"Ludden warns．
Frame and Fit：
Some frames are metal，but most quality sports sunglasses have durable（耐用的） and lightweight plastic frames．
Take a look at the frame and make sure the joints are strong．The arms and earpieces should stay put on your face-but not so tight that it hurts or gives you a headache．"You want sunglasses to be so comfortable that you forget about them，"Ludden says．
68．When you choose sunglasses，you shouldA．
A．go to a specific store
B．a(chǎn)void the ones with glass lenses
C．buy specific sunglasses for each sport
D．buy the costly ones strong and protective
69．What can we learn about sunglasses frames？B
A．Metal ones are better．
B．Plastic ones are better．
C．The looser，the better．
D．The tighter，the better．
70．According to Ludden，when purchasing sunglasses，you should first pay attention to theirC．
A．lenses B．frames C．functions D．designs．
分析 本文是關(guān)于購(gòu)物建議的應(yīng)用文．一副合適的太陽(yáng)鏡不僅可以保護(hù)眼睛，還可以讓你看上去時(shí)尚很多．本文就如何選擇太陽(yáng)鏡給出了一些建議．
