更多"Some was collected by this season’s"的相关试题:
[简答题]Some was collected by this season’ s plants as carbon compounds. Some was stored by plants and trees ages ago. (Passage 3 )
[单项选择]Nuclear power plants are some of the largest producers of () wastes, with each plant producing barrels of radioactive material that must be stored in special protective containers.
A. biodegradable
B. hazardous
C. reasonable
D. durable
[单项选择]Some plants are very _________ to light; they prefer the shade.
A. sensible
B. flexible
C. objective
D. sensitive
[单项选择]Some plants are very __________ to light; they prefer the shade.
A. sensible
B. flexible
C. objective
D. sensitive
[填空题]Some plants are __________ (对光线很敏感); they prefer the shade.
[填空题]
· Look at the list below. It shows some product sectors of healthcare
market.
· For questions 6-10, decide which sector (A-H) of the market
each person on the opposite page should consult.
· For each question,
mark the correct letter (A-H) on your Answer Sheet.
· Do not use any
letter more than once.
{{B}}PRODUCT SECTORS OF HEALTHCARE MARKET{{/B}}
A Vitamins and Dietary
Supplements
B Cough, Cold and Allergy Remedies
C Digestive
Remedies
D Eye Care
E Wound Treatments
F Adult Mouth
Care
G Calming and Sleeping Products
H Smoking Cessation
Aids
Kevin Lee is looking for some products to help him quit smoking.
[单项选择]Australia’s most common plants are ( ).
A. oaks and elms
B. palms and pines
C. willows and poplars
D. eucalypts and wattles
[填空题]Some plants ________________ (对污染很敏感) that they can only survive in a perfectly clean environment.
[单项选择]
Diseases of Agricultural
Plants
Plants, like animals, are subject to
diseases of various kinds. It has been estimated that some 30,000 different
diseases attack our economic plants; forty are known to attack corn, and about
as many attack wheat. The results of unchecked plant disease are all too obvious
in countries which have marginal food supplies. The problem will soon be more
widespread as the population of the world increases at its frightening rate.
Even in countries which are now amply fed by their agricultural products there
could soon be critical food shortages. It is easy to imagine the consequences of
some disastrous attack on one of the major crops; the resulting famines could
kill millions of people, and the resulting hardship on other millions could
cause political upheavals disastrous to the order of the world.
Some plants have relative immunity to a great many diseases, while others have a
susceptibility to them. The tolerance of a particular plant changes as the
growing conditions change. A blight may be but a local infection easily
controlled; on the other hand it can attack particular plants in a whole region
or nation. An example is the blight which killed virtually every chestnut tree
in North America. Another is the famous potato blight in Ireland in the last
century. As a result of that, it was estimated that one million people died of
starvation and related ailments.
Plant pathologists have made
remarkable strides in identifying the pathogens of the various diseases.
Bacteria may invade a plant through an infestation of insect parasites carrying
the pathogen. A plant can also be inoculated by man. Other diseases might be
caused by fungus which attacks the plant in the form of a mold or smut or rust.
Frequently such a primary infection will weaken the plant so that a secondary
infection may result from9 its lack of tolerance. The symptoms shown may cause
an error in diagnosis10, so that treatment may be directed toward bacteria which
could be the result of a susceptibility caused by a primary virus
infection.How many diseases are known to attack wheat
A. Around 30,000.
B. Around 140.
C. Around 29,960.
D. Around 40.