A) merely B) always C) mainly D) almost
A. merely
B. always
C. mainly
D. almost
查看答案
A. off and on B. back and forth C. up and down D. far and wide
According to the passage, what effect does industrialized countries\' using a lot energy cause？
A. The levels of carbon monoxide rise.
B. The levels of carbon dioxide rise.
C. The focus of pollution moves to the home.
D. The world's natural resources are unequally shared.
A．matter B．mindC．trouble D．care
A. matter
B. mind
C. trouble
D. care
若三棱锥的本个侧面都是边长为1的等边三角形，则该三棱锥的高为
微信支付 
支付宝支付