下列关于生态系统的叙述,正确的是( )
下列操作既能加快硝酸钾的溶解速度,又能增加硝酸钾溶解质量的是( )
____ A.cow B. horse C. sheep D. animal
____ A. pig B. litter C. throw D. open
____ A. zoo B. farm C. great D. school
____ A. moo B. tiger C. quack D. neigh
____ A. duck B. cows C. horses D. pigs
-- _______ your mother like oranges?
-- Yes, she likes to eat ________ very much.
—I'll ________ a bus.