The notice should be put in the most conspicuous place so that all the students can be well-informed.
Giải chi tiết:
conspicuous = dễ thấy, hiển nhiên
A. thông thường
B. nghi ngờ
C. dễ thấy
D. đẹp
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.