Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
7. What does the pencil counting experiment suggest?
A. Children are capable of counting complex numbers.
B. Children are hard to report the number of blue or red ones.
C. Children cannot count the blue and red ones separately.
D. Children cannot find the total number without directions.
8. According to the passage，what is guiding children's growth?
A. A biological clock of human body.
B. An internal clock of computing.
C. Children's self-consciousness.
D. The introduction of mathematics.
9. When can children set the table with impressive accuracy?
A. After they learn to walk and talk.
B. After they could count things.
C. Before they could walk and talk.
D. Before they could count things.
10. What is the passage mainly about?
A. To explain that people are born to compute.
B. To illustrate children's counting skills.
C. To prove that people gradually learn to compute.
D. To suggest the ways to learn computing.