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C. shorter ( ) 2. My boxes are bigger than . A. you ( ) 3. My ruler longer than yours. A. am C. are ( ) 4. The little elephant is 150cm . A. tall B. long ( ) 5. Line up from to , class! A. smaller, bigger B. young, old ,taller ( ) 6. It is shorter the white one. A. than B. then C. the ( ) 7. The length of a killer whale is meters. A. 15 B. 8 C. 25 ( ) 8. A sperm whale has teeth. A. 20 B. 50 C. 40 ( ) 9. The killer whale can . A. dive into the deep cold water B. fly in the sky C. jump out of water ( ) weather is . A、 nice