Heartwood is often darker than the sapwood.
举一反三
- 下列哪个树木器官不参与光合碳产物分配（ ）。 A: 心材（heartwood） B: 边材（sapwood） C: 花果 D: 根系
- In general, people in the east are ___ those in the west. A: short and dark B: shorter and darker than C: as short and darker than D: as shorter and darker as
- The tall tree, leaves are darker than those of the other two, is as old as grandpa.
- Generally, the colour of the tie should always be darker than that of the wearer's shirt. A: 正确 B: 错误
- Men in the United States and Britain have heart attacks about for times___women. A: more often than B: as often than C: more often as D: often as