A. Alzheimer's disease is deadly.
B. Though unsuccessful, the experiments did show some benefits derived from nerve growth factor.
C. The experiments did not show any significant benefits from nerve growth factor.
D. More work needs to be done to understand the effects of nerve growth factor.
D
Đáp án D
Thông tin ở đoạn 1: “English began to spread around the globe as a result of exploration, trade (including slave trade) (A), colonization (C), and missionary work (B).”
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