单项选择题

What has happened since the end of the ice age（）

A．Many species have developed a habit of migration.
B．Many species have become less sensitive to climate.
C．Many new species have come into existence.
D．Many species have moved further north.

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单项选择题
What measure did the wildlife biologists take to in- crease the number of bald eagles（）

A．They brought in bald eagles from Canada.
B．They explored new ways to hatch baby bald eagles.
C．They developed new types of feed for baby bald eagles.
D．They found ways to speed up the reproduction of bald eagles.
单项选择题
What measure was taken against floods in London in the 1980s（）

A．A flood wall was built.
B．Rescue teams were formed.
C．An alarm system was set up.
D．50 underground stations were made waterproof.
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