泄殖腔膜分为腹侧份的（）和背侧份的（）。

投资项目资金筹措不正确的做法是( )。

A．选择较经济方便的渠道和方式，以降低综合的资金成本
B．为了减少对项目利润的影响，尽量选择负债筹集资金的方式
C．按照资金投放需要，适时取得资金
D．举债经营可以给项目带来一定的好处，但还要避免可能产生的债务风险

------Have you known each other for long?

------ Not very, ________we started to work in the ABC Motor Company.

A．before　

B．since

C．when

D．after

苏子降气汤主治证的病机是( )

A．外感风寒，内停水饮

B．肾阳不足，痰饮上壅于肺

C．素有痰热，复感外寒，郁而为热

D．表邪化热，肺热炽盛

E．真阳不足，肾不纳气

治疗哮喘发作期寒证，应首选（）

A．三子养亲汤

B．小青龙汤

C．射干麻黄汤

D．涤痰汤

E．麻杏石甘汤

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 main idea of this passage is that________.

A．light causes sea color

B．sea coloration is varied because of a combination of length of light waves and microscopic plant life and silt

C．microscopic plant life causes sea color

D．water composition causes sea color