Questions 22 to 25 are based on the conversation you have just heard.

A．By spending lesson time on pronunciation.
B．By not using books on speech mechanics on pronunciation.
C．By not giving students a clear mental picture of the difference between sounds.
D．By making ill-informed comments upon students’ pronunciation.

A．The woody stems contain more wafer than the leaves.
B．Only part of the carbon dioxide in the plants is synthesized.
C．The mineral elements will not be absorbed by the plant unless dissolved in their roots.
D．Air existing around the leaf is found to be saturated.