题目内容：

    As for child vaccinations, parents usually get paperwork lost, or forget whether their child is up to date. Now a group of MIT researchers has developed a new way to address this problem: inserting the record directly into the skin. Along with the vaccine, a child would be injected with a bit of dye that is invisible to the naked eye but easily seen with an app that shines special light onto the skin. The dye would be expected to last up to five years.

The system would provide quick and easy access to vaccination history, and add little to the cost or risk of the procedure. “In developing countries where medical records may not be as complete or as accessible, there can be value in having medical information directly associated with a person,” says Ana Jaklenec, lead author of the study.

Delivering the dye required the researchers to find something that was safe and would last long enough to be useful. “That’s really the biggest challenge we overcame in the project,” says Jaklenec, adding that the team tested a number of dyes hut could not find any that lasted when exposed to sunlight. The team ended up using a technology called quantum dots, which were originally developed to label cells during research. The dye has been shown to be safe in humans.

“When people were still getting vaccinated against smallpox, they got a visible scar on their arm that made it easy to identify who had been vaccinated and who had not. But obviously, we didn't want to give people a scar.” Jaklenec says, noting that her team was looking for something that couldn’t be seen. The researchers also wanted to avoid technologies that would raise even more privacy concerns, such as databases with names and identifiable data.

The researchers hope to add more detailed information to the dots, such as the date of vaccination. Along with them, the team eventually wants to inject sensors that could also potentially be used to track aspects of health such as insulin levels in diabetics.

1.What can we learn from the first 2 paragraphs?

A.A new system has been developed to track the history of vaccination.

B.The cost of updating vaccination history is high.

C.The dye injected into children can be seen with naked eyes easily.

D.Carrying around one’s medical record is convenient.

2.What was the biggest challenge for the researchers?

A.Labeling cells. B.Delivering a number of dyes.

C.Finding the safe and long-lasting material. D.Inventing a technology called quantum clots.

3.It can be learned from the text that the researchers________________.

A.are trying to find a vaccination against diabetics.

B.have injected sensors to track aspects of health.

C.are sure to leave no scars on those who are vaccinated.

D.hope to add more detailed information to the quantum dots while maintaining privacy.

4.How does the author feel about the project?

A.Disappointed B.Enthusiastic

C.Indifferent D.Uncertain