are - do not like

* Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

In 1962 the American Telephone and Telegraph Company launched telstar,________communications satellite to transmit telephone and television signals.

A. it was a first

B. that was the first

C. first it was a

D. the first

Nhân tố sinh thái nào sau đây là nhân tố vô sinh?

A. Quan hệ cộng sinh

B. Sinh vật kí sinh – sinh vật chủ

C. Sinh vật này ăn sinh vật khác

D. Nhiệt độ môi trường

câu a)

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