阅读下列短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。
 
    
        
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 TV VOICE PRO AIR $299 USD  |  Hearing Specialists Develop   New Ultra-Lightweight (超轻的) TV Listening Earbuds (耳塞): At just Half   an Ounce, they Weigh 90% Less than Traditional TV Headphones!
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            | HAVING TROUBLE HEARING THE TV CLEARLY? Get ready to   clarify TV dialogue like never before, with our new Ultra-Lightweight   Wireless TV Listening Technology. Big and heavy TV   headphones are now a thing of the past, thanks to Hearing Specialists who   have developed new ultra-lightweight wireless TV earbuds, which enable the   wearer to hear the speech and dialogue on any TV show with clarity. The   unique speech clarification audio works for those with any level of hearing   loss, and has been proven to outperform even the most advanced digital   hearing aids for TV clarity. TV VOICE PRO AUTOMATICALLY CLARIFIES TELEVISION DIALOGUE s Revolutionary TV speech enhancement technology made simple s Speech enhancement technique based upon clinical hearing assessments   of over 1,000 people with varying levels of hearing loss and proven TV   listening difficulty s Connects to any TV in under 2 minutes FEATURES WITH THE TV VOICE PRO AIR SYSTEM ² Listen at your own volume without altering the TV audio for   others in the room ² Uses state-of-the-art Bluetooth technology for uninterrupted   listening up to 35 feet from your TV. ² Simple volume control located on the earphones, with additional   loud volume range to suit those with even severe hearing loss. ² Sit back, lie down, or move around. So comfortable to use, you   can watch TV any way you like. ² Is guaranteed to work with any TV, new or old. | 
        
            | As a special   offer, Readers Digest readers can use Gift   Voucher (礼券) Code   READERSDIGEST at the TV Voice Pro website checkout for $50 OFF the purchase   price, and free shipping available until December 31, 2020. |   | Visit www.TvVoicePro.com to order online or over the phone on   415 277-2026. 30 DAY MONEY BACK GUARANTEE | 
        
        
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21.TV VOICE PRO AIR is aimed at _____.
A.TV designers                                             B.people with hearing difficulty
C.hearing specialists                                      D.wearers of digital hearing aids
22.According to the advertisement, TV VOICE PRO AIR enables the wearer to _____.
A.enjoy TV even over 35 feet from his/her house     
B.improve his/her hearing ability in daily life
C.listen to TV clearly at whatever volume        
D.watch more TV programs
23.What can be learned about TV VOICE PRO AIR from the advertisement?
A.You can get a refund within 30 days if dissatisfied with it.
B.You need to pay $50 for its shipping if you buy it in 2021.
C.You can get a discount as long as you use Gift Voucher Code.
D.You need to place a special order for it if you have severe hearing loss.