使用显微镜时，“观察”操作步骤正确的是（　　）

①转动粗准焦螺旋，使镜筒缓缓下降，直到物镜接近玻片标本为止；

②左眼向目镜内看，右眼睁开；

③把要观察的玻片标本放在载物台上，用压片夹夹往；

④反方向转动粗准焦螺旋，使镜筒缓缓上升；

⑤略微转动细准焦螺旋．

澳大利亚有一生态难题，许多牛粪往往将草场上的牧草遮住导致牧草枯死，破坏了草场。从生态系统成分看，牛是____ ，其数量过多，排出的粪便破坏了牧草这一____  ，破坏了原有的生态平衡。从中国引入蜣螂后，清除了粪便，恢复了生态平衡，这里的蜣螂起到了____   的作用。

 阅读下面短文，掌握其大意，然后从各题所给的ABCD四个选项中选出最佳选项。

      Do you ever watch old movies? Maybe you will see one with Carole Lombard. She was a famous 1 in the 1930s. She died when she was only 34. In her 2life she made 70 movies!

      Lombard's real name was Jane Alice Peters: In 1921, she was playing baseball in the 3near her home. A movie director 4her and decided to put her in amovie. She was only 13 at the time. The movie was one of the last silent movies. She acted(表演) so well that she 5 the hearts of some people. At 16, she left school to act.

     In 1925, she had an agreement with a 6studio, 20th Century Fox. The studio gave 7 a new name, and she acted in several films. Then, at age 18, she was in a bad car accident. The accident left scars(伤疤) on herface. The studio broke the agreement, but she did not 8. She continued to act.

       It was Paramount Studio that made Lombard a 9. She made many movies for the studio. She also married two of their stars. Lombard was married to actor William Powell for only 23 months. 10 seven years later, she married the great love of her life, actor Clark Gable. It was a great Hollywood love story.

辨析题：写出题干错误的史实或观点，简要说明理由。