题目内容

These machines can accept payment through facial recognition______ a matter of seconds.

A. in
B. as
C. for

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Both Alipay and WeChat are gradually laying ____ the face-scanning payment market.

A. down
B. in
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The convenience brought __________ mobile payment is obvious.

A. from
B. in
C. by

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A. from
B. into
C. by

We must __________ the protection in technology, law, and other aspects

A. stong
B. strength
C. strengthen

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