药物有轻质与重质之分，是指( )
A．真密度不同B．粒密度不同C．堆密度不同D．空密度不同E．吸湿率不同
连词成句。
1. same, they, the, are
______________________________________
2. a, tail, a, cat, and, has, fur
3. different, are, they
4. wings, a, bird, and, has, feathers
.
．--- How do you find the movie The Cove?
---__________sad. It__________a bloody picture of dolphins being killed.
A．Looks; presents
B．Looking; presents
C．Looks; presented
D．Looked; presented
