需要使用复杂先进而又尖端的科学技术才能进行生产的产业是______产业。 A．资源密

光合作用的产物有（　　）

A．二氧化碳

B．氧气

C．有机物

D．水

预包装食品在标签指明的贮存条件下，保持品质的期限（）

A、生产日期 

B、储存期 

C、保存期 

D、包装日期 

E、最佳食用期

Which of the following statements about the demand and supply of money is most accurate People who are:（）

A. buying bonds to reduce their money balances will increase the demand for bonds with an associated increase in interest rates.

B. selling bonds to increase their money balances will reduce the demand for bonds with an associated reduction in interest rates.

C. holding money when interest rates are higher will try to reduce their money balances and, as a result, the demand for money decreases.

（5分）人类的生活和生产活动，都离不开能源。在石油、电能、风能、煤碳、天然气、秸杆、水力、水煤气这些能源中，属于“二级能源”的（两种）是____ _        属于“不再生能源”的（三种）是___              _。