在平静呼吸过程中，胸膜腔内压比大气压低，故称胸内压为（）

A.正压

B.负压

C.等压

D.高压

E.低压

根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。

小题1:He is selfish. Though I have lent him much money, he seemed never ______ (满足的).

小题2:Millie’s car crashed into a tree yesterday, now she is still under ______ (治疗).

小题3:Compared with the new buildings, the old ones seem even _______. (丑陋)

小题4:Nobody is in the school. The students have ______(或许) gone for a school trip.