题目内容：

    A team of well-known developers have built a security tool, Scanguard™, which they believe will be the last piece of software consumers will ever need.

Product Manager, David, from ScanGuard, explains, "The software can increase the security immediately by distinguishing any hidden dangers or online tracking cookies. Also, it discovers and removes unnecessary files and cached memory—the files that can make your PC run slow. To have perfect performance and keep your computer secure, schedule the scan to run every 7 days. It roughly takes 10 minutes to fully analyze your system."

"People already love the system. Our plan is to give as many free scan licenses away so that it gains widespread use until we think that's enough for us to start charging. If you own a Windows Computer then you are allowed to have a free security scan. We advise users not to hesitate and try it cautiously and bravely before it's too late. We feel good knowing that we're helping make things faster and more secure for our customers,'' he continues.

The Scanguard™ free plan will, offer you a version of the software which will monitor your PC in full for threats (威胁)，unwanted software or potentially dangerous tracking cookies. If the software finds out threats you can remove them from your system by hand now or pay for it to have the software do the automatic job about them.

Once you have downloaded the software you can also have free licenses for all of your devices, including your,Office & Home PC, Smartphone & even Tablet. It's so convenient! It’s no surprise that thousands of computer owners are taking advantage of this approved security system to keep themselves and their devices safe.

1.Which of the following is one of the advantages of the application?

A.Making the computer work faster.

B.Recognizing the files more quickly.

C.Helping turn on the computer faster.

D.Finding lost files more quickly.

2.What does David want to express in paragraph 3?

A.They'll reduce the price of the software.

B.They need to improve the Scanguard™.

C.They will charge users fees sometime.

D.They'll end the software-making plan.

3.What can we know about the Scanguard™?

A.It is the team's last piece of software.

B.It can remove dangers automatically.

C.It needs updating every seven days.

D.It can recycle unwanted software.

4.What is the author's attitude towards the application?

A.Doubtful. B.Ambiguous.

C.Cautious. D.Favorable.