题目内容
（请给出正确答案）
A．High tides that occur in spring
B．Low tides that occur in spring
C．Tides associated with the perpendicular positioning of the Sun and Moon
D．Tides associated with the alignment of the Sun and Moon
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更多“What are spring tides？”相关的问题
A.low water neap
B.low water spring
C.high water neap
D.high water spring
Branford reef is ().
A.A hard sand shoal marked with a light
B.Completely submerged at all stages of the tide
C.Surrounded by rocks awash at low water spring tides
D.A small，low，sandy islet surrounded by shoal water
请在第____处填上正确答案。
A. For an adult，time goes fast year by year．
B. It controls，for example，the flapping of birds’wings，the beating of the heart and the rising and setting of the sun．
C. The larger the animal is，the longer its life span is and the slower its life tempo is．
D. The tide goes out when the moon moves away and its attraction is weaker．
E. We always tend to think all the animals have the same sense of time as human beings．
F. The second spring tide takes them back to the sea．
What can be concluded when the current tide of knowledge revolution ebbs？
A．Productivity will rise.
B．Productivity will receive no impact.
C．Population growth will slow down.
D．Population growth will become accelerated.
A、Surrounding conditions.
B、The grounds of seabed.
C、Weather, wind, tide current.
D、All of above.
Time in the Animal World
Rhythm controls everything in Nature．______（1）．
The sun provides a basic time rhythm for all living creatures including humans．Nearly all animals are influenced by sun cycles and have developed a biological clock in their bodies following these cycles．The moon also exerts its force and influence on the sea．Its gravitational attraction causes the rising of the tide．______（2）．When the moon is behind the Earth。centrifugal force causes the second tide of the day．
Animals living in tidal areas must have the instinct of predicting these changes，to avoid being stranded and dying of dehydration．Since the time of the dinosaurs，the king crab has been laying eggs1 at the seaside in a set way2．To avoid predator fish3 the eggs are always far from seawater and protected by sand．In the following two months，the eggs undergo dramatic changes related to the cycles of the moon4 When the second spring tide comes，the young king crabs have matured．_____（3）．
Most of the mammals，either the giant elephant or the small shrew ,have the same average total number of heartbeat in their lifetime．Shrews live only for two and a half years，and spend their life at a high speed and high tempo．Animals like shrews with a pulse rate of 600 per minute have an aver．age total of eight hundred million heartbeats5 throughout their life．The African elephant has a pulse rate of 25 beats per minute，and a life span6 of 60 years．The size of the body determines the speed of life．______ （4）．
As we get older，our sense of time is being influenced by the physiological changes of our body．The elderly spend more time resting，and do few sports．______ （5）．For a child, a week is seen as a long time．
A．For an adult，time goes fast year by year．
B．It controls，for example，the napping of birds’wings，the beating of the heart and the rising and setting of the sun．
C．The larger the animal is，the longer its life span is and the slower its life tempo is．
D．The tide goes out when the moon moves away and its attraction is weaker．
E．We always tend to think all the animals have the same sense of time as human beings．
F．The second spring tide takes them back to the sea．
第 11 题 请选择（1）处的最佳答案．
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