42. Which ability is most important for dogs to rescue people trapped in snow?
A、Sharp hearing.
B、Swift movement.
C、Extraordinary smelling.
D、A strong memory.
Ⅱ. Vocabulary and Structure ( 15 points ) Directions : There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the Answer Sheet. 6. Jonathan and Joe left the house to go for__ after supper.