1. Directions
You will read passages on the topic and then answer questions about them. You may find vocabulary at the end of the test. Read the questions carefully before choosing the correct answers.2. Questions of the test
Question 1. What is a crab's exoskeleton made of?
A) Calcium carbonate
B) Chitin
C) Keratin
D) Iron
Question 2. What is the function of a crab's pincers?
A) Eating
B) Fighting
C) Signaling
D) All of the above
Question 3. How many species of crabs are known to exist?
A) About 1,000
B) About 5,000
C) About 7,000
D) About 10,000
Question 4. Where do most crabs live?
A) Sea-water
B) Fresh-water
C) On land
D) All of the above
Question 5. What do crabs eat?
A) Algae
B) Molluscs
C) Other crustaceans
D) All of the above