Questions 18 to 20 are based on the following passage.
At the end of the passage, you will be given 15 seconds to answer the
questions. Now listen to the passage. What does the speaker imply
A．Teachers should occasionally make home visits to parents. B．Too many children are lazy. C．School principals do more than their share in interpreting the curriculum to the parents. D．Only a small part of the school day should be set apart for drilling in arithmetic.