Mr. Bartholomew is said to be a fairly well-to-do man.
Giải chi tiết:
Đáp án là B: well-to-do: khá giả; sung túc >< poor: nghèo
Nghĩa các từ còn lại : unimportant: không quan trọng; wealthy: giàu có; important: quan trọng
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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.