转移性右下腹痛
A．急性胆囊炎 B．急性阑尾炎 C．胃、十二指肠溃疡穿孔 D．急性胰腺炎 E．右输尿管结石
参考答案：B
As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.
A．gradually
B．selflessly
C．fluently
D．frequently
口腔黏膜中蛋白质合成最活跃的是（）
A.角化层
B.粒层
C.棘细胞层
D.颗粒层
E.基底层
