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由于血液粘稠度降低而产生的杂音常见于：
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Dictation: Mobile PaymentsThis article will be played three times. Listen carefully, and fill in the numbered spaces, withthe appropriate words you have heard.Because most 1 carry a smartphone or another mobile device with them at all times in order to communicate with others and look up information, mcommerce ( 2 ) is anatural next step in ecommercc. You can use your smartphone in 3with the NFCreaders that are appearing in retail stores, train stations, and other locations to pay for purchases. You can also purchase 4 tickets, order and pay for meals at some restaurants, and perform other transactions 5your smartphone and then have a QRcode or other proof of purchase displayed on your phone to6the transaction at the 7location. To send money to individuals (to split a check,8someone for purchased tickets or gifts, or just pay back a9, for instance), you can use your mobile 10app or a mobile payment appsuch as Pal Pay or Google Wallet Mobile payment processing (collecting payment for goods and services via a mobile device) is another11 mcommerce trend that is growing rapidly.Mobile payments12 utilize a credit card reader attached to a smartphone or media13 that enables individuals as well as businesses to accept credit card payments. For instance,14 workers such as repair technicians can easily collect payment as soonas the service is completed and15 at craft shows can accept credit card payments to increase potential sales. It also enables16 buying in retail stores, where sales17 can process purchases on the sales floor instead of making the customer wait in line at a18 counter. This can help the experience feel more personal to the customer as well asavoid 19 during busy periods due to long checkout lines. This concept is also being expanded to businesses, such as hotels that offer check-in service in the 20 as soon as guests enter the hotel.[音频]
用于防治宠物软骨症的维生素是( )?
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