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发布时间:2023-10-22 14:15:19

[单项选择]Increase in the temperature of tropical soil _______.


A. might cause the overflow of flood
B. may lead to the loss of organic nitrogen in it
C. will produce a great deal of organic nitrogen
D. is harmless to the growth of rain forests

更多"Increase in the temperature of trop"的相关试题:

[单项选择]Increase in the temperature of tropical soil _______.


A. might cause the overflow of flood
B. may lead to the loss of organic nitrogen in it
C. will produce a great deal of organic nitrogen
D. is harmless to the growth of rain forests
[单项选择]What has happened to the soil


A. It has become hard to break.
B. It has become soft for the plow.
C. It is going to be baked though hard.
D. It is going to be an ongoing thing to get wors
[单项选择]Fertilizer applied to soil can replace depleted nutrients.()
A. organic
B. acidic
C. exhausted
D. desirable
[单项选择]How is one tropical weather system distinguished from the other


A. Wind speed.
B. Rainfall.
C. Water temperature.
D. Direction of approac
[单项选择]If roundworms are removed from the soil and placed in a liquid, they thrash helplessly around.
A. carelessly
B. tirelessly
C. powerlessly
D. heartlessly
[单项选择]Top soil ______.


A. is good for agriculture
B. is useless and unproductive
C. is found only in desert regions
D. is dry and sandy
[单项选择]When did Islam come to the soil of Pakistan


A. B.C 327B.C
B. C.200D
C. D.711 D
[单项选择]

Too much metal in the soil is considered pollution. Yet too little metal in a person’s diet can cause health problems. An American scientist says the answer to both problems may be plants that take up large amounts of metal in their tissues.
David Salt is an expert on plants at Purdue University in West Lafayette, Indiana. He is working with plants that store large amounts of metals.
In recent years, scientists have shown interest in using such plants to clean up harmful waste materials, Professor Salt says such plants also could be used to improve people’s diets or even to create foods that fight cancer.
Humans need a number of metals in their diets, including iron and zinc. These metals are needed in very small amounts, however. That is why they are called micronutrients. The lack of micronutrients is blamed for health problems in many developing countries. Children and pregnant women are mostly affected.
Recently, Mr. Salt an
A. copying tissues from wild plants that take up selenium naturally into crop plants
B. copying genes that causes the plants to take up selenium from the soil
C. moving selenium from the tissues of wild plants into crop plants
D. moving genes from wild plants that take up selenium naturally into crop plants

[单项选择]The diversity of tropical plants in the region represents a seemingly ( ) source of raw materials, of which only a few have been utilized.
A. exploited
B. controversial
C. inexhaustible
D. remarkable
[单项选择]Package tours to tropical regions in Asia and the Pacific are subject to ______ changes in demand.


A. affectionate
B. stationary
C. seasonal
D. favorable

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