______ called just now, but he didn't mention his full name.

单项选择题What did the researchers learn from the second step （）

A．The trees in the new forest were in different size.
B．The insects in the new forest had a different taste.
C．Tamarins could get used to the new environment.
D．Above 80% of tamarins survived.

单项选择题A Stetson is a （）

A．large bandanna
B．Mexican sombrero
C．tough vaquero
D．wide-brimmed hat