Based on the provided text, the following statements are true:
* Cobras are very dangerous.
* They have sharp teeth, they bite.
* A cobra can see in the dark very well, and stand on its tail.
* Cobras eat small mammals, birds, eggs, lizards and other snakes.
* A cobra hunts other animals for its food.
Based on the information given, we can deduce the following:
* Cobras are not dangerous. - False. The text states they are very dangerous.
* Cobras can't see at night-time. - False. The text says "A cobra can see in the dark very well".
The other options:
* You can't see a cobra in Africa. - There is no information to confirm if you can see a cobra in Africa or not.
* A cobra can climb trees. - There is no information to confirm if a cobra can climb trees or not.
* Cobras are big snakes. - It says they can be more than 5 meters long, so they can be considered big, but there is no explicit confirmation about their size.