The propeller on the boat needed to be repaired.A propeller is used to（）
A. push forward
B. push back
C. pull back
D. not push or pull
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If you study the mortality rate among infants of a culture, you study（）
A. their growth rate
B. what they eat
C. how they live
D. their death rate
In the future, we will be able to teletransport goods. This means we will be able to（）
A. send goods over the telephone
B. send goods over vast distances
C. send goods by boat
D. send goods by ship
It is often easier to think about things in retrospect.Retrospect means（）
A. consider in advance
B. consider looking backwards in time
C. consider looking forwards in time
D. not consider at all
The bleach discolored the rug. This means the bleach（）
A. put color into the rug
B. took color away from the rug
C. made a hole in the rug
D. cleaned the rug
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