题目内容
（请给出正确答案）
Which feature makes FM radio relatively noise free？
A．Its radio frequency is varied.
B．It is static free.
C．It has "preamplifier control" section.
D．It has a detector circuit.
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A、comsumer surplus higer than producer surplus in international market
B、comsumer surplus less than closed situation
C、both comsumer surplus and producer surplus higer than closed situation
D、comsumer surplus less than producer surplus in international market
A、pyruvate carboxylase
B、fructose-1,6-bisphosphatase
C、pyruvate kinase
D、glucose-6-phosphatase
A、convert
B、invert
C、revert
D、reverse
The Indian elephant has a bulging forehead and a back that is convex, or bowed out. The African elephant has a sloping forehead, and its back usually has a dip in it behind the shoulders. The trunk of the Indian elephant tends to be smoother than that of its African cousin. Indian elephants have five toenails on their front feet and four on their hind feet. African elephants may have one nail fewer on each foot.
Indian elephants roam the forests of India, Sri Lanka, Burma, Malaysia, Sumatra, and Borneo. African elephants range over most of Africa south of the Sahara.
Some scientists divide African elephants into two species -- the larger bush elephant and the smaller forest elephant. The forest elephant lives in the Congo River basin. It has smaller rounder ears, and it grows only about 2.5 meters tall. Adult bush elephants are somewhat larger even than Indian elephants. Big males may be 3.5 meters high at the shoulder and weigh more than 6 metric tons.
Both Indian and African elephants have all the toes on each foot enclosed in a common covering of skin. Only the toenails show. Both, as adults, have tough, leathery hides that may be an inch thick. Both have very little hair. But their eyes are fringed with lashes that sometimes measure more than 12 centimeters long. And their tails are tipped with clusters of thick, wiry hair. Both Indian and African elephants live in herds, and their ways of life are very much the same.
Which of the following is NOT true of the African elephants？
A．They live to the south of the Sahara.
B．They can be divided into two species.
C．They are all larger than Indian elephants.
D．They have bigger ears than the Indian elephants.
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