“That is a well-behaved boy” .
Giải chi tiết:
Đáp án là B: well- behaved : thái độ ứng xử khôn khéo >< behaving improperly: ứng xử không đúng cách
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Population growth rates vary among regions and even among countries within the same region.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.