问题
单项选择题
以下关于财政收入与支出的说法中不正确的是（）。
A.财政收入大于财政支出是最佳情况
B.财政赤字在一定限度内可以刺激经济增长
C.当财政支出大于财政收入时，中央政府不可避免的要发行公债
D.减免税收政策实质为减少财务收入
答案
参考答案：A
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以下关于财政收入与支出的说法中不正确的是（）。
A.财政收入大于财政支出是最佳情况
B.财政赤字在一定限度内可以刺激经济增长
C.当财政支出大于财政收入时，中央政府不可避免的要发行公债
D.减免税收政策实质为减少财务收入
参考答案：A
| The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles. Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists. |
The growth of phytoplankton is often limited by the availability of ______.
A．oxygen
B．hydrogen
C．nitrogen
D．carbon dioxide