A mediocre student who gets low grades will have trouble getting into an Ivy League college.
Giải chi tiết:
Đáp án là A. mediocre: tầm thường >< excellent: xuất sắc
Nghĩa các từ còn lại: lazy: lười; average: trung bình; moronic: khờ dại
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.