I．听录音，选出你听到的句子。每小题念两遍。（共5个小题，每小题1分）
( ) 1. A. I have already watered the trees.
B. I have already watered the flowers.
C. I haven't watered the trees yet.
( ) 2. A. Leaves make food for people.
B. Leaves turn yellow in autumn.
C. Leaves turn green in spring.
