问题
解答题
一件工作甲每天完成总工作量的
|
答案
1.5×（
+1 4
），1 3
=1.5×
，7 12
=
；7 8
答：两人合作1.5天一共完成总工作量的
．7 8
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一件工作甲每天完成总工作量的
|
1.5×（
+1 4
），1 3
=1.5×
，7 12
=
；7 8
答：两人合作1.5天一共完成总工作量的
．7 8
| 完型填空。 | ||||
| Do you like Dolphins (海豚)? Dolphins live 1 water, but they are not fish. They are mammals (哺乳 动物) that live in water. It has to (不得不) breathe (呼吸) air to the top of the water very often. A dolphin's nose isn't 2 to see. It's just a very 3 hole on top of the dolphin's head. This hole is called a blowhole. A dolphin 4 up every minute or so to breathe. It opens blowhole and takes air in, and then goes back into the water again. It can stay 5 the water for six or seven minutes if it has to. A dolphin's ears are very small, 6 its mouth is very 7 . It has almost one hundred teeth. A dolphin 8 very fast. Scientists are studying ways to 9 boat go faster through the 10 . | ||||
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