Imagine you are a caveman out innocently picking berries when suddenly you come nose to nose with a sabre-tooth tiger. (a) while you were simply gathering, the tiger was actually hunting, and the sight of you makes his mouth water. luckily for you, millions of years of evolution has endowed you with a set of automatic weapons that take over in the event of an emergency. (b) at the sight of the tiger, your hypothalamus sends a message to your adrenal glands and within seconds, you can run faster, hit harder, see better, hear more acutely, think faster, and jump higher than you could only seconds earlier. (c) your heart is pumping at two to three times the normal speed, sending nutrient rich blood to the major muscles in your arms and legs. (d) the tiny blood vessels under the surface of your skin close so you can sustain a surface wound and not bleed to death. even your eyes dilate so you can see better.
when a paragraph contains two main ideas, it should be divided into two paragraphs. choose the letter at the point where the passage should be divided, or indicate that it should be left as one paragraph.
a) a
b) b
c) c
d) d