托福考试

【单选题】A condenser is a heat exchanger （） steam or vapor loses heat and returns to liquid form. 
A. what 
B. in which 
C. in whose 
D. that 

【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.

【单选题】 Ella Baker spent (her adult life) working for social change (by) lecturing, writing, (teacher), and organizing adult literacy (programs).
A．her adult life
B．by
C．teacher
D．programs

【单选题】 The word "drab" in line 24 is closest in meaning to
A．( precise
B．( poor
C．( simple
D．( dull

【单选题】 What does the author say in paragraph 1 regarding most species in Earth's history
A．( They have remained basically unchanged from their original forms
B．( They have been able to adapt to ecological changes
C．( They have caused rapid change in the environment
D．( They are no longer in existence