室外保护装置的接地线，总接地线截面不小于（）平方毫米。A.20 B.25 C.30

— What do you think _____ an important part in their lives?

— Folk music. [ ]

A. plays

B. takes

C. makes

D. acts

_Could I go to the movie this Sunday, Dad?

_ Yes, you_____. But you ______ come back before nine.

A．should, can

B．must ,have to

C．can , have to

D．need, must

比213多68的数是（    ）。

Both the summer and the winter Olympic Games are held every four years on a _______ basis.

A．magical

B．regular

C．familiar

D．logical

患者心烦不寐，心悸不安，头晕，耳鸣健忘，腰酸梦遗，五心烦热，口干津少，舌红，脉细数。其治法是（）。

A.清心宁神，养阴除烦

B.养阴生津，除烦宁神

C.清火除烦，宁心安神

D.滋阴降火，养心安神

E.滋阴宁心，镇惊安神