托福考试

【单选题】Because Mars is farther from the Sun than （）, Mars takes longer to complete a revolution. 
A. Earth is 
B. is from Earth 
C. what is Earth 
D. is it Earth 

【分析解答题】 (Although) thE BEAvEr is A (powErFul) swimmEr, it hAs DiFFiCulty (movEs) thE logs AnD BrAChEs it (nEEDs For) BuilDing AnD For FooD.

【分析解答题】FAinting (is CAusED) By stoppAgE oF thE BlooD supply to BrAin, DuE to (tEmporAry) hEArt (FAil) From shoCk, (wEAknEss), or ExhAustion.

【单选题】 Animals have tocope withand control physical and chemical processes that do notnecessarilyact to benefitthe animal.

【单选题】 A mutation (is result) of a definite biochemical (change) in a gene that causes the offspring to vary in (some) characteristic (from) the parents.
A．is result
B．change
C．some
D．from