下列有关缢蛏的说法错误的是（ ）
A：属于软体动物
B：依靠肉质的足运动
C：用肺呼吸
D：外套膜分泌物形成贝壳
Most of the representatives attending the conference are not________the project, for it costs too much.
有关样方选取的叙述，正确的是( )
