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 

【单选题】A block and tackle is a （） of pulley blocks and ropes used for pulling or hoisting large objects. 
A. mechanical set special 
B. set special mechanical 
C. special mechanical set 
D. special set mechanical 

【单选题】
单项选择

【单选题】 The planet Venus is almost exactly the same size and mass __________ Earth, with a similar interior, including a nickel-iron core.
A．( to
B．( as
C．( is
D．( than

【单选题】 Which of the following does the passage mainly discuss
A．(The effect of glaciers on climate
B．(Damage from glaciers
C．(Glacier formation
D．(The location of glaciers