题目内容
（请给出正确答案）
Why do dolphins use a signature whistle？
A．To communicate their feelings.
B．To navigate through the water.
C．To hunt in dark or murky water.
D．To identify themselves in a group.
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更多“Why do dolphins use a signatur…”相关的问题
A、Folic acid
B、Biotin
C、Pantothenic acid
D、Thiamine
A、○Because some tools used for painting were also used for hunting
B、○Because cave inhabitants were known to prefer animal food rather than plant food
C、○Because some of the animals are shown wounded by weapons
D、○Because many hunters were also typically painters
Whatever the cause of the heat may be, we do know that the earth gets hotter down we dig.
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A．Humans can now talk to dolphins.
B．It is the basis of sonar technology.
C．The fishing industry can avoid dolphins.
D．Blind people use echolocation to navigat
A．prehistoric
B．predominant
C．primary
D．successful
A．Over 100000 CFS before the building of the Dam.
B．8000～20000 CFS before the building of the Dam.
C．8000～100000 CFS after the building of the Dam.
D．20000 CFS at peak rate after the building of the Dam.
Fahrenheit scale
*____________
*____________
Modern Celsius scale
*____________
*____________
Kelvin Scale
*____________
Answer Choices
A. Water freezes at 0°and boils at 100°.
B. Water freezes at 273°and boils at 373°.
C. Water freezes at 100°and boils at 0°.
D. Water freezes at 32° and boils at 212°.
E. 0° is the temperature at which saltwater boils.
F. 0° is equal to the freezing temperature of water.
G. 0°was what was believed to be the lowest possible temperature of a solution of saltwater and ice.
The countries or regions whose scores going down
* ____________
* ____________
The countries or regions whose score going up
* ____________
* ____________
* ____________
Answer Choices
A. Thailand.
B. Poland.
C. The United States.
D. France.
E. Hong Kong SAR.
F. Malaysia.
G. Britain.
[*]
Answer Choices
A. The Ice Man was discovered by two hikers.
B. It is certain that his death was not caused by starvation.
C. The Ice Man was found in Italy.
D. There were many everyday apparatus at his side.
E. The Ice Man was discovered in Austrian.
F. The Ice Man lived in around 2000 B C.
G. A long DNA sequences of him was recovered.
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