【经典例题】
When autumn arrives in the United States and Canada, you can see one of nature’s greatest scenes—yearly migration(迁徙)of the monarch butterflies(帝王蝶).
...
However, the number of these colorful butterflies has dropped in recent years. The US Fish and Wildlife Service said that nearly a billion monarchs have disappeared from overwintering sites(越冬地点)since 1990, The Washington Post reported. One of the main reasons, experts say, is that farmers have used herbicides(除草剂)on the milkweed(马利筋)plants that these butterflies feed on.
What might the writer talk about next after the passage?
A. How to plant more trees.
B. How to research these butterflies.
C. What we can do to protect these butterflies.
D. Why these butterflies are important.

点拨：联系上文可知，帝王蝶数量减少是因为其赖以生存的食物减少了。由此可推断，作者接下来可能会提出保护帝王蝶的措施。故选C。

【解析】
上文提到帝王蝶的数量近年来有所下降，主要原因是它们赖以生存的马利筋因农民使用除草剂而受影响。根据行文逻辑，在提出问题及原因后，作者接下来很可能会介绍保护帝王蝶的相关措施，因此选C。
【答案】
C
【知识点】
阅读理解下文推断
【点评】
本题属于英语阅读理解中的推理判断题，需结合上文提及的帝王蝶数量减少的问题及原因，依据常见行文逻辑推断下文内容，考查学生的逻辑推理能力。
【难度系数】
0.7

It’s late autumn in the Arctic Ocean(北冰洋). The water is covered with ice. It’s difficult for the white whales to breathe, so they come up to find openings in the ice to get enough air. As the winter is coming, they know it’s time to leave.
A group of about a hundred white whales swim south toward the Bering Sea. Halfway through their journey, their enemy, an orca(虎鲸)is swimming toward the white whales. With the help of large ice floes(浮冰), the white whales swim faster than the orca. This gives the white whales time to swim away.
After a few more days of swimming, they arrive at the Bering Sea. The white whales will rest, hunt, and play here until April, and then they’ll swim back to the Arctic Ocean.
What’s the best title for the passage?

A.How Can White Whales Live in Summer?
B.White Whales Are on the Move.
C.White Whales Are in Great Danger.
D.When and Where Do White Whales Give Birth?

点拨：根据文章首段最后一句“As the winter is coming, they know it’s time to leave.”和文章最后讲白鲸会在四月游回北冰洋可知，本文主要讲述白鲸在冬天来临时游离北冰洋，在四月再游回的故事。故选B。

【解析】
文章主要讲述了白鲸因冬季将至，从北冰洋迁往白令海，途中躲避虎鲸，在白令海栖息至四月再返回北冰洋的迁徙过程。分析各选项：A选项“白鲸如何在夏季生存”，文中未提及相关内容；C选项“白鲸处境危险”，文中仅提到迁徙途中遇到虎鲸，并非文章核心内容；D选项“白鲸何时何地生育”，文中完全未涉及该话题。B选项“白鲸在迁徙中”准确概括了文章主旨，故选B。
【答案】
B
【知识点】
英语阅读理解主旨归纳
【点评】
本题考查英语阅读理解的主旨归纳能力，解题需结合全文内容，排除与文章无关或片面的选项，精准把握文章核心内容。
【难度系数】
0.7