A:①②③
B:①⑤⑥
C:②④⑥
D:①③⑤⑥
40×10=____ 20×30=____ 40×70=____ 80×30=____
80÷4=____ 600÷3=____ 4500÷9=____ 360÷6=____
银杏被列为中国四大长寿观赏树种之一.银杏树与桃树相比,最主要的区别是( )
一 David ______ has breakfast.
一 It's bad for his health. I am worried about him.