题目内容
These animals __________their environment; __________, they have learned how to live successfully in their habitat.
A. are all used to; that is
B. all used to; that is
C. are all used to; for example
D. all used to; for example
答案:A
提示:
提示:
be used to “习惯于……”;that is“即,也就是说”。
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