对于特殊工程而言，施工阶段应指定的安全技术措施为( )。A．雨期进行作业，应有防触

女性，18岁，确诊暴发型流行性脑脊髓膜炎，应首选下列哪个药物治疗()

A.青霉素

B.磺胺嘧啶

C.头孢氨苄

D.头孢唑酮

E.复方新诺明

英国科学家普里斯特利曾做过如下实验：在甲、乙两个密闭的玻璃容器中，甲容器中放入一只小白鼠，乙容器中放了一盆绿色植物和一只小白鼠，都给予充足的光照，他发现小白鼠在乙容器中比在甲容器中存活的时间长．请根据以上实验现象分析回答：

（1）甲容器中小白鼠很快死亡的原因是______，乙容器中小白鼠比甲容器中小白鼠存活时间长的原因是______．

（2）实验中甲和乙是一组______实验，实验时两个容器中选用的小白鼠应该是______．

（3）如果用黑布将乙容器罩住，那么小白鼠存活的时间比没有罩住时存活的时间要______，因为用黑布罩住的植物不能进行______，但能进行______，说明植物的光合作用需要______．

（二） Mozart was born in what is now called Austri, but, at that time, it was part of the Holy Roman Empire. He was baptized the day after his birth at St. Rupert’s Cathedral. His father Leopold was from Augsburg. He was a minor composer, and an experienced teacher. In the year of Mozart’s birth, his father published a violin textbook, which achieved a great success. In the fourth year of his age his father, for a game as it were, began to teach him a few minutes and pieces at the clavier. He could play it faultlessly and with the greatest delicacy, and keeping exactly in time. At the age of five, he was already composing little pieces, which he played to his father who wrote them down. While Leopold was a devoted teacher to his children, there is evidence that Mozart was keen to progress beyond what he was taught. His first ink spattered composition and his efforts with the violin were of his own initiative and came as a surprise to Leopold. Leopold eventually gave up composing when his son’s outstanding musical talents became evident. He was Mozart’s only teacher in his earliest years and taught his children languages and academic subjects as well as music. During Mozart’s youth, his family made several European journeys in which he played at the court in Munich, and at the Imperial Court in Vienna. A long concert tour spanning three and a half years followed, taking the family to the courts of Munich, Paris and London. During this trip, Mozart met a great number of musicians and acquainted himseff with the works of other composers. These trips were often arduous. Travel conditions were primitive; the family had to wait for invitations and reimbursement from the nobility. They endured long, near -fatal illnesses far from home. After one year father and son set off for Italy, leaving his mother and his sister at home. This travel lasted from December 1769 to March 1771. As with earlier journeys, Leopold wanted to display his son’s abilities as a performer and a rapidly maturing composer. After finally returning with his father from Italy on 13 March 1773, Mozart was employed as a court musician by the reler of Salzburg, Prince Archbishop Hieronymus Colloredo. The composer had a great number of friends and admirers in Salzburg. Despite these artistic successes, Mozart grew increasingly discontented with Salzburg and redoubled his efforts to find a position elsewhere. One reason was his low salary. In August 1777, Mozart resigned his Salzburg position and, on 23 September, ventured out once more in search of employment, with visits to Augsburg, Mannheim, Paris, and Munich. Since Archbishop Colloredo would not give Leopold leave to travel, Mozart’s mother Anna Maria accompanied him. Mozart became acquainted with members of the famous orchestra in Mannheim, the best in Europe at the time. He also fell in love with Aloysia Weber, one of four daughters in a musical family. There were prospects of employment in Mannheim, but they came to nothing, and Mozart left for Paris on 14 March 1778 to continue his search. One of his letters from Paris hints at a possible post as an organist at Versailles, but Mozart was not interested in such an appointment. Mozart’s new career in Vienna began well. He performed often as a pianist, notably in a competition before the Emperor on 24 December 1781, and he soon "had established himself as the finest keyboard player in Vienna".

When Mozart was young he made several European journeys with his families in which he played at the court______

A．in Munich, Vienna, Paris and London

B．in Munich, Vienna, Paris and Italy

C．in London, Vienna, Paris and Italy

D．in Munich, Vienna, Italy and London

含氮激素作用的第二信使是指（）

A.激素

B.受体

C.腺苷酸环化酶

D.cAMP

收养子女有人数限制吗？