按照马克思主义观点，教育起源于 【 】 A．本能 B．劳动 C．无意识模仿 D．竞争

物质的量浓度相等的CH₃COOH和CH₃COONa溶液等体积混合，下列关系式中正确的是

A．c (Na⁺)=2c(CH₃COO^-)+2c(CH₃COOH)

B．c(H⁺)=c(CH₃COO^-)+c(OH^-)

C．c (Na⁺) > c (CH₃COO^-)>c(OH^-)>c(H⁺)

D．c(CH₃COO^-) +2c(OH^-) = 2c(H⁺) + c(CH₃COOH)

Giacomo Puccini was born in 1858 and was a son of a musical director. __ 小题1:    He is remembered as a master of opera.

   小题2:    Many early forerunners of Impressionistic Music including Rimsky-Korsakov, Strauss, Schoenberg and Stravinsky, inspired him greatly.

Turandot, an opera based on an Italian drama by the same name, is by far considered to be one of Puccini’s most popular and most performed works.

It’s a pity that Puccini had no chance to watch his own great opera himself.     小题3:    

In this opera you can hear a traditional Chinese folk song, which is titled Molihua（茉莉花）or Jasmine Flower.     _____小题4:____ Among them the version sung in Jiangsu, a province in south China, is the most popular one. By admiring the jasmine flower, the song celebrates the sweetness and beauty of romantic love.     小题5:    In 1804 the song was published in a book by a British diplomat(外交官), making it the first Chinese folk song that gained popularity outside China.

A．During his music career, Puccini was also influenced by other musicians.

B．At the end of the 18th century, it was first translated into English.

C．Though Puccini received training in various areas of music, his true love was in opera.

D．Puccini’s operas are strong in emotion and conflict.E. Turandot is performed regularly all over the world.

F. The opera was first performed in 1926, two years after Puccini’s death.

G. There are many different versions of Molihua or Jasmine Flower in different parts of China.

在对动物的行为进行研究时，观察法和实验法之间的关系是[ ]

A．彼此独立、互不联系

B．观察法比实验法重要

C．实验法比观察法重要

D．观察法中可以没有实验，但实验法中离不开观察

造成"亚健康状态"的原因是复杂多样的。一般认为（）常起主导作用。

A.病理因素

B.心理因素

C.生理因素

D.体质因素

地面安全阀阀门促动器工作压力为1000PSI时，按照规范要求水压试验压力应该是（）。（）

A、1000PSI

B、1500PSI

C、2000PSI

D、1250PSI