Most of the sandstorm in our country _______ in spring from March to May. [ ]

A. happen

B. happens

C. is happening

“壮水之主，以制阳光”是指（）。

A.以阳中求阴之法调整阴阳偏衰

B.以阴中求阳之法调整阴阳偏衰

C.泻热之法，调整阳偏衰

D.以补阴之法，治疗阴虚阳亢之证

E.以补阳之法，治疗阴虚阳亢之证