sun's corona(日冕), it will have to bear temperatures reaching 1,400 C, as well as deal with serious radiation. So how will the probe survive?

　　"The spacecraft and most of the payload will be protected by a shield(保护罩) from the sun's heat, which will be as high as 50 times what we experience on Earth," deputy project scientist Nour Raouafi told Discovery Magazine.

　　According to NASA, this shield is a special 11.5 cm-thick carbon-composite shield that will be positioned between the probe and the sun's corona.

　　It's advanced technology like this will make the probe's trip to the sun much smoother. If everything goes as planned, the probe will reach a speed of 692,018 kilometers per hour as it orbits the sun, setting a new record for the fastest man-made object in history, NBC noted. It will fly close to the sun 24 times between 2018 and 2025, NBC added.

　　The "mission to touch the sun" will "not only make history by answering questions that have puzzled scientists for decades, but it may also lead to the discovery of new phenomena that are completely unknown to us now," Raouafi told Discovery Magazine. "This mission has the potential to push solar research into a new direction," he added.

3. What do you know about the Parker Solar Probe?

　A. It's twice the size of a car.

　B. It has an 11.5-inch-thick shield.

　C. It was designed to carry a powerful rocket.

　D. It's the fastest probe ever designed.

4. According to the article, what is the main challenge the Parker Solar Probe will face?

　A. A shortage of power. B. Strong radiation.

　C. Venus's strong gravity. D. Going too fast.

5. What's the main purpose of the last paragraph?

　A. To stress the importance of advanced technology.

　B. To prove the mission is the greatest move in human history.

C. To suggest there is a long way to go in solar exploration.