超快的，高速的 A: ultra-fast B: extra-fast

You have to pay a(n)premium for express delivery. A: extra charge B: extra price C: extra tip D: extra bonus

Liu Xiang runs! A: What fast boy B: What fast C: How fast D: How a fast

Look!Lindaisrunning________________(fast)and________________(fast).Iamsureshewillwin.

If demand is price elastic and price decreases, then A: the extra revenue from the extra units sold is exactly offset by the loss in revenue due to the lower price B: more information is necessary to determine what happens to total revenue C: the extra revenue from the extra units sold is less than the loss in revenue from the lower price D: the extra revenue from the extra units sold exceeds the loss in revenue from the lower price

Providing extra information___________________________

Go The Extra Mile

He was late for the class today because he didn't run ______ catch the bus. A: enough fast to B: fast enough to C: fast enough D: enough fast

The rhythm of Chen tai Chi is (). A: Slow to store and slow to send B: Fast to store and slow to send C: Slow to store and fast to send D: Fast to store and fast to send

Question 3: It is a ________ bicycle. A: red fast B: fast red