-Students should try to do a little studying every evening throughout the term, rather than study all night

during the week before the exam.  

---Exactly. __________.  [ ]

A. Slow but sure win the race

B. Delays are dangerous  

C. Practice makes perfect

D. The early bird catches the worm

义齿间隙指的是

A．主承托区
B．缓冲区
C．副承托区
D．中性区
E．边缘封闭区