[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 )

[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 )

[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

[判断题]

Users might shorten their car’s life by using some fuel or oil additives which cause engines and fuel systems such problems as displacement of protective chemicals in gasoline and engine oil and corrosion of fuel pumps or gas tanks.

[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.

[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

[单项选择]　　　 Archaeological discoveries have led some scholars to believe that the first Mesopotamian 　　　 inventors of writing may have been a people the later Babylonians called Subarians. According to 　　　 tradition, they came from the north and moved into Uruk in the south. By about 3100B.C, They 　　　 Were apparently subjugated in southern Mesopotamia by the Sumerians, whose name became (5) 　synonymous with the region immediately north of the Persian Gulf, in the fertile lower valleys of 　　　 the Tigris and Euphrates. Here the Sumerians were already well established by the year 3000B.C. 　　　 They had invented bronze, an alloy that could be cast in molds, out of which they made tools and 　　　 weapons. They lived in cities, and they had begun to acquire and use capital. Perhaps most 　　　 important, the Sumerians adapted writing (probably from the Subarians) into a flexible tool of (10)　 communication. 　　　 Archacologists have known about the Sumerians for over 150 years. Archacolog
A. equivalent to
B. important for
C. respected in
D. familiar with