What characteristics make dolphins easy to train as star performers？
A. High intelligence.
B. Sociability.
C. Enjoying playing with each other and also with the humans, with whom they come in touch.
D. Being able to remember humans that they have met.
查看答案
A．itemB．measureC．meansD．way
A. item
B. measure
C. means
D. way
What is the population of the world in 2000 according to the passage？
About 9 billion.
B. About 6 billion.
C. About 3 billion.
D. About 5 billion.
What kind of problem can be solved by the new technology？
A. It can help mankind solve the problem of planting tomatoes.
B. It can help mankind solve the problem of watering.
C. It can help. mankind solve the problem of salt.
D. It can help mankind solve the problem of feeding its population.
The result of scientists studying dolphins may prove that ______.
A. humans will be able to establish real communication with dolphins
B. dolphins can't talk at all
C. dolphins can talk through language that human beings will never understand
D. humans will never be able to talk with dolphins
微信支付 
支付宝支付