She is a very generous old woman. She has given most of her wealth to a charity organization.
Giải chi tiết:
Đáp án A: generous = hào phóng, mean = bần tiện
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.