【单选题】Nowadays sled dogs are still necessary when ______.
A.
there are severe weather conditions
B.
flying machines are full with passengers
C.
snow machines use up power in the Arctic region
D.
people need partners during the travel
【简答题】累积增长量等于相应各时期的逐期增长量之()。
【判断题】Nowadays,more and more people like to travel, when they travel, they may hitchhike.
【简答题】Nowadays, it is possible to travel to distant parts of the globe in several hours. This can result in the traveler ending up in a part of the world where time is different from his or her own “body cl...
【简答题】32S×100D 134×88
59/60 〃
【简答题】列竖式计算,*号题要验算. ÷4; *84÷3; 96÷6; *41÷4; 88÷7; 62÷3; 98÷9; 59÷3; *88÷6.
【判断题】累计增长量等于相应时期各个逐期增长量之差。()