据测算,我国每天因土地沙漠化造成的经济损失为1.5亿元,若一年按365天计算,我国一年因土地沙漠化造成的经济损失为多少元(用科学记数法表示,且保留两个有效数字)?
解:1.5×108×365=5.475×1010≈5.5×1010元.
答:我国一年因土地沙漠化造成的经济损失大约为5.5×1010元.
解释划线字的意思及整个词语的含义。①永垂不朽:_________________________②丰功伟绩:______________________③瞻仰:_____________________________④天堑:_____________________________⑤上溯:_____________________________
It was late. She opened the door ________ because she didn't want to wake up her grandma.
I think you should complain, , of course, you are happy with the situation.