“The table is too heavy for me to move alone.”
Giải chi tiết:
Đáp án là A. heavy: nặng >< light: nhẹ
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.
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.