问题
选择题
下列关于测定土壤中微生物的数量，正确的叙述是[ ]
A．一般选用103～107倍的稀释液分别涂布
B．测定放线菌的数量，一般选用103、104和105倍稀释
C．测定真菌的数量，一般选用103、104和105倍稀释
D．当第一次测量某种细菌的数量，可以将101～107倍的稀释液分别涂布到平板上培养
答案
答案：B
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下列关于测定土壤中微生物的数量，正确的叙述是[ ]
A．一般选用103～107倍的稀释液分别涂布
B．测定放线菌的数量，一般选用103、104和105倍稀释
C．测定真菌的数量，一般选用103、104和105倍稀释
D．当第一次测量某种细菌的数量，可以将101～107倍的稀释液分别涂布到平板上培养
答案：B
| 选词填空。其中有两项是多余的。 | |
It was the early autumn of my 1._____ year at a junior high school, and my old school was far away. As a result, no one knew who I was.I was very 2_____,and afraid to make friends with anyone. Every time I heard the other students talking and laughing, I felt my heart 3._____.I couldn't talk to anyone about my problem, and I didn't want my parents to worry 4._____ me. Then one day, my classmates talked happily with their friends, 5._____ I sat at my desk unhappily as usual. At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned 6._____ He looked at me and, without a word, smiled. Suddenly, I felt the touch of something bright and friendly. It made me feel happy, lively and warm. That smile 7._____ my life. I started to talk with the other students and made friends. Day by day, I became more active and closer to everyone in my class. The boy with the lucky 8._____ has become my best friend now. One day,I asked him why he smiled, but he couldn't 9._____ smiling at me! It doesn't matter cven if he didn't tell me the 10._____ ,because all the dark days have gone. Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and it will smile back. |