Eventually, a different kind of animal evolves. Sometimes many of the animals on Earth go extinct at the (42) ______ time. Scientists call this a mass extinction.

Đáp án A

Kiến thức: Từ vựng

Giải thích:

    A. same: cùng, giống                                         B. similar + to: giống, tương tự

    C. different: khác                                              D. various: đa dạng

=> at the same time: cùng lúc

Sometimes many of the animals on Earth go extinct at the (42) same time.