The clouds over the city are different from ________ in the country: the weather in the city is also different from ________ in the country.

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The clouds over the city are different from ________ in the country: the weather in the city is also different from ________ in the country.

1. A.
   this; those
2. B.
   this; these
3. C.
   these; that
4. D.
   those; that

At least thirty times Bobby had tried to climb the snowy mountain, but he had never   46   the top. His friend old Peeper, who knew a lot about his failures,  47  Bobby to try again. He gave Bobby a pair of sunglasses and said, “If it starts clouding over, put on the glasses, or if your feet start hurting, put them on too. The glasses are very 48 . They’ll help you.” Bobby received the gift without much thought.
The day came when he was to have another   49 . About two hours after he started, he felt his feet hurting. Then he  50 what Peeper had said, and put on the glasses. The pain was pretty bad, but   51  the sunglasses he could clearly see the snow-covered mountain top, so he went on.
  52 , clouds were gathering. But this time Bobby could still see the  53 through the clouds. He kept climbing , leaving the clouds behind, forgetting his pain, and finally arriving at the top. It was certainly worth it. His feeling of   54  was extremely good, almost as great as that  55 view. The mountain below was surrounded (包围) by a sea of clouds. He couldn’t believe that the clouds were as thick as that, so he looked more closely at the sunglasses, and discovered the  56  . Peeper had engraved (镌刻) the snow-covered mountain top on the sunglasses,  57  Bobby could see it when he was looking upwards!
Bobby __58  that the only difficulty to reaching the top had been losing   59  when he couldn’t see the mountain top. He was thankful that Peeper had used that little trick to help him see that his   60   was never impossible, and that it was still there, where it had always been.