问题 选择题 选出不同类的词。( ) 1. A. road ( ) 2. A. house ( ) 3. A. restaurant( ) 4. A. short ( ) 5. A. beside( ) 6. A. movie theatreB. streetB. meB. pizzaB. socksB. addressB. restaurant C. liveC. horseC. hot dogC. sweaterC. houseC. hungry 答案 1. C 2. B 3. A 4. A 5. A 6. C
／H2CO3＜20／1，原发性H2CO3↑