题目内容：

    Even for a first-time visitor to China, it is impossible to ignore the popularity of Quick-Response (QR) codes. These square-shaped black-and-white symbols in WeChat or Alipay where QR codes are scanned to add new friends or make payments.

The QR Code system originated in Japan. The engineer Masahiro Hara felt the limitation of the one-dimension barcode in use and thus developed the QR codes which could carry data horizontally and vertically. QR codes could hold much more information than barcode due to their extra dimension. In addition, QR codes have larger data capacity, smaller print—out size and higher resistance to dirt and damage, which make them widely applied in many other applications.

Though the technology of QR codes is complicated, we can easily create our own QR codes with the help of QR code generators, many of which are available online for free. Users could enter the data they wish the QR code to display, and the generator turns it into a symbol that can be printed or displayed in electronic form. The process of creating QR codes could be really fun when we customise the design of the codes according to our specific needs. For instance, we can adjust the color, add a logo, and create social options etc. Moreover, dynamic (动态的) QR codes are also available. They are more various than standard QR codes because they allow users to edit data entered previously whereas data in standard QR codes cannot be edited once printed. Plus, don’t limit your QR code to one mobile scanner. Anyone can scan your code with any reader. A lower barrier to entry makes success more likely for you and the user.

Meanwhile, we must also recognize the vulnerability of QR codes. Due to its easy access, criminals can steal simply by replacing the QR codes with their own, routing cash into their own bank accounts. Hence, we should all become more conscious towards virtual money transactions through QR codes and participate in additional security measures.

1.Which of the following is NOT a function of QR codes?

A. Data storage.

B. Scanning reader.

C. Social networking.

D. Mobile payment.

2.Why is barcode mentioned in paragraph 2?

A. To introduce the main topic.

B. To show the author’s attitude.

C. To highlight the features of QR codes.

D. To add some background knowledge.

3.Which of the following best explains “vulnerability” underlined in paragraph 4?

A. Threat. B. Weakness.

C. Difficulty. D. Simplicity.

4.Which is true about QR codes according to the text?

A. They were first used in China.

B. The generators charge the users a lot.

C. Data editing is possible in printed QR codes.

D. More scanning devices are available in reading QR codes.