Russia Today: US losing pace in military space race against China

[Hamartia Antidote]

You didn't answer some crucial questions:

1,The rocket landing needs fuel. What's the cost for the extra fuel? By the way, I believe it will need much less fuel to land in a certain area if it is parachute landing.

Apparently it uses 6.5% of the fuel to turn back and land.
I'm sure the price varies by the day. Somewhere between $200K-$300K for the entire fuel...so that's not very much. Less than $18K

it will need much less fuel to land in a certain area if it is parachute landing.

You still have to get a rocket the size of a 15 to 20 storey building back to a main road so you can bring it back to the launch area. Unless ypu think the parachute is going to always put you in a certain spot.

2, The launched rocket' engines and shell are subjected to several thousand ℃ high temperature. What materials can resist such high temperature without any properties change and shape change so the rocket can be reused without any potential risk? Aren't the materials much expensive than normal rockets'?

The Falcon 9 first stage hits ~Mach 10 and then cuts the engines. It obviously is built to withstand high friction temperatures going up nevermind down.