Jim's decided to buy a phonograph even though they are now redundant.
Giải chi tiết:
redundant: thừa, dư => Đáp án là C. unnecessary: không cần thiết
Các từ còn lại: old-fashioned: lỗi mốt; reproduced: được sản xuất lại; expensive: đắt
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.
Population growth rates vary among regions and even among countries within the same region.