题目

油轮泄漏会造成严重的环境污染，吸油菌可将原油分解为无机物，从而消除原油泄漏造成的海水污染。某科研小组欲筛选分离能高效降解海水中原油的菌株进行以下实验操作，回答下列问题。（1）采集样品与选择培养：从___中采集样品；然后将样品适当稀释后接种于液体培养基中富集，从培养基的成分来看，应以 ___为碳源，从培养基的理化性质来看，应使用___水来配制该培养基。进行选择培养的目的是____。（2）鉴别培养与筛选：将选择培养后的样Should friends be different or the same? We asked some people what they think and this is what they said.James GreenI like to have friends who are like me. I'm quieter than most of the kids in my class, and my best friend Yuan Li is quiet, too. There are some differences, though. I'm smarter than Yuan Li. She's stronger than me. Huang Lei It's not necessary to be the same. I like to have friends who are different from me. My best friend Leo is taller and more outgoing than me. We both like sports, but Leo is more athletic than me. He always beats me in tennis. And I'm quieter than he is. Mary SmithI don't really care. My best friend is Carol. Carol is very funny, and more outgoing than I am. But we both like doing the same things. I think differences are not important in a friendship. (根据短文内容，选择正确答案：【1】Both James Green and Yuan Li are_____.A. outgoing B. quiet C. funny D. strong【2】Who is Mary Smith's best friend?A. Huang Lei. B. Leo C. James D. Carol【3】The underlined (划线的 ) word "athletic" means “_________” in Chinese.A. 聪明的 B. 友好的 C. 健壮的 D. 可爱的【4】How many opinions(观点) about friends are mentioned(被提到) in the passage?A. One B. Two C. Three D. Four【5】Which of the following is true according to the passage?A. There are some differences between James Green and his best friend.B. Huang Lei likes friends who have the same looks as himself.C. Mary Smith thinks differences are important in a friendship.D. Mary thinks it’s important to be different.