We can use either verbal or non – verbal forms of communication.
Giải chi tiết:
Đáp án là B. verbal: bằng lời nói, bằng miệng = using speech ( sử dụng lời nói )
Population growth rates vary among regions and even among countries within the same region.
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.