As it is used in paragraph 4 of the passage, the word "porous" means______.A．having or full of holesB．lacking physical strength, energy, or vigorC．easily broken or hurtD．powerful against harm.
题目
As it is used in paragraph 4 of the passage, the word "porous" means______.
A．having or full of holes
B．lacking physical strength, energy, or vigor
C．easily broken or hurt
D．powerful against harm.