4 颗豆豆
1. 单选题
30 秒
What is the smallest dolphin species mentioned in the passage?
A. Orca.
B. Hector's dolphin.
C. Blue whale.
2. 单选题
30 秒
What is the main idea of the passage?
A. Dolphins are the smartest creatures in the ocean.
B. Dolphins are amazing creatures worth protecting.
C. Dolphins use echolocation to attack other animals.
3. 单选题
30 秒
How do dolphins communicate with each other?
A. By making loud noises.
B. By using a variety of clicks, whistles, and body language.
C. By echolocating.
4. 单选题
30 秒
What does the word "sleek" probably mean in the passage?
A. Slow.
B. Smooth and shiny.
C. Large and heavy.
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