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阅读短文，并按要求完成下列小题。

Drones (无人驾驶飞机) can do lots of things, including taking pictures from the sky and watching wild animals. Now these small flying robots begin to change the way of farming.

Looking for sick plants

Drones can find bacteria (细菌) that are harmful to plants in the air from a few kilometers away. Farms can check the drones’ air samples (样本) and try to find ways to protect their plans before the bacteria get to them.

Counting cows

When flying over cows, drones can follow up the cows and find out which fences need fixing. There are also special cameras on drones. They can help farmers look for animals that could harm their cows.

Water watch

After watering the fields, we can often see some places may dry out faster than others. Other places might not get water at all. Drones can look over the field and make a 3-D map. Using the map, farmers can find out which parts of a field are dry or need improvement.

Spraying pesticide (喷洒农药)

Different parts of a field might have different altitude (海拔). Drones can check for this when flying above the land. Then, they change their height so that they can spray the correct amount of pesticide over each part of the field. This is more useful than traditional pesticide spraying. Drones can finish spraying a field much faster than with traditional machines.

1-2题完成句子；3题简略回答问题；4题找出并写下全文的主题句；5题将文中划线句子译成汉语。
1．Farmers can check the drones’ air samples to find ways to _________ before the bacteria get to them.
2．The special cameras help farmers _________ animals which may harm their cows.
3．What can the farmers do by using the 3-D map?
___________________________________
4．___________________________________
5．___________________________________