According to most scientists, when did the first hominids--direct human forbears that were fully separated from the apes--appear on Earth?
A) a few billion years ago
B) a few thousand years ago
C) about a billion years ago
D) a few million years ago
E) about 100 billion years ago
Question 2
When a rocket ship gaining speed in remote, gravity-free outer space runs out of fuel, it
A) gains speed for a short time, then slows down to a constant velocity.
B) gains speed for a short time, slows down, and eventually stops.
C) no longer gains speed.
D) comes to a quick stop.