托福考试

【单选题】Most of North America receives （） some form of continuous plant cover except in the arid and semiarid Southwest. 
A. moisture to sustain sufficient 
B. sufficient moisture to sustain 
C. to sustain sufficient moisture 
D. sufficient to sustain moisture 

【单选题】
单项选择

【单选题】Ethnology, usuAlly ConsiDErED A BrAnCh oF CulturAl Anthropology, is oFtEn DEFinED As thE sCiEntiFiCAlly stuDy oF thE origin AnD FunCtioning oF humAns AnD thEir CulturE.

【单选题】 Onyx is a mineral that can be recognized its regular and straight parallel bands of white, black, or brown.

【单选题】 The pelican is a water bird with a (large) pouch attached to (its) bill, which it uses (as) a scoop (for) catch small fish.
A．large
B．its
C．as
D．for