Section C

Passage 1

Scientists have identified thousands of known ant species around the world. And only a few of them bug humans. Most ants live in the woods or out in nature, there they keep other creatures in check, distribute seeds and clean dead and decaying materials from the ground. (16) A very small percentage of ants do harm to humans. But those are incredibly challenging to control. They are small enough to easily slip inside your house, live in colonies that number in the tens of thousands to the hundreds of thousands, and reproduce quickly. That makes them good at getting in and hard to kick out. Once they settle in, these insects start affecting your home. In addition to biting ants, other species can cause different kinds of damage. (17)Some, like carpenter ants can undermine a home structure, while others interfere with electrical units. Unfortunately our homes are very attractive to ants because they provide everything the colony needs to survive, such as food, water and shelter.

So how can we prevent ants from getting into our homes? (18)Most important of all, avoid giving ants any access to food, particularly sugary food because ants have a sweet tooth. We also need to clean up spills as soon as they occur and store food in airtight containers. Even garbage attracts ants, so empty your trash as often as possible, and store your outside garbage in a lidded can well away from doors and windows.

16. What does the passage say about ants?

[C] Only a few species cause troubles to humans.

17. What do we learn from the passage about carpenter ants?

[B] They can cause damages to people’s homes.

18. What can we do to prevent ants from getting into our homes?

[A] Deny them access to any food.

解析：

本篇短文的题材是生物，和蚂蚁有关，主要讲的是某个品种的蚂蚁有害且难以控制，并介绍了如何预防蚂蚁进入住宅的措施。做短文要利用好答案提示词和句型，做第18题利用起强调作用的答案提示词组most important of all以及表并列的提示词also可以得出答案。