According to some estimates, at most for how long can we use the fossil fuel reserves？A．20

Carved pumpkins are used to scare away vampires, according to some superstitious peop

According to paragraph 2, which of the following led some early researchers to believe tha

Whats the number of the dead according to the International Red Cross estimation？A．1,200.B

According to Paragraph 2， some organizations check their systems to find out[A] whethe

According to the passage the belief that some UFO

According to some researchers by measuring the le