As the name suggests, anti-climbing paint is a special type of security paint designed to prevent unwanted guests from trying to access a property. It is a non-drying coating that, once applied onto a surface, makes it almost impossible for someone to climb the surface.

Once coated in anti-climbing paint, a surface remains slippery for a minimum of three years, keeping its protective properties in both hot and cold weather conditions. The paint is usually applied in thick 3mm layers and develops a smooth and shiny skin similar to that of regular paint, while beneath this skin, the paint is still wet, so once an intruder tries to climb a surface covered in it, the skin is damaged and the wet coating makes climbing to the top of any surface impossible.

Because of the slippery nature of anti-climbing paint, whoever coats their property with this stuff is required to install signs warning of the use of the paint to absolve (免除) themselves of responsibility. In some places, without these signs, a person could be legally responsible for injuries from someone that gets hurt on their property, even if they were breaking in illegally.

One of the advantages of anti-climbing paint, is that it sticks to anything it comes in contact with, making criminals easier to identify. But it can also be considered a drawback. If anyone accidentally comes in contact with anti-climbing paint, they can charge for damages, as this stuff is extremely difficult to remove from human skin, let alone most fabrics. So it is recommended that anti-climbing paint be used at heights above 1.8 meters, where the chances of passers-by coming in contact with it are very low. Typically, it is applied at 2.4 meters above the ground. However, this does nothing to prevent the paint from coming into contact with cats and various birds.

Although paint companies advertise the paint as an effective anti-trespassing (防止擅自进入) solution, the truth is that it is advisable to think carefully before applying anti-climbing paint, because it can land you in lawsuits. 

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1. Which word can replace the underlined word “intruder” in the second paragraph?（词义猜测）

A    Guest.

B    Passer-by.

C    Detective.

D    Criminal.