题目

材料l  桃果实表面光滑对有毛为显性。现将毛桃的雌蕊授以纯合光桃的花粉，该雌蕊发育成的果实为毛桃，科学家研究发现果皮是由子房壁发育而成的，果皮（子房壁）是母体的一部分，尽管毛桃和光桃受核基因控制，但果实的表面光滑与否显现出来的是母本性状，即母本基因型是毛桃，该果实一定是毛桃，但应该注意的是，科学家将子代（F1）种子种下后，所结果实全是光桃，即表现出来的是F1的基因型所控制的性状。 材料2  椎实螺螺壳的螺旋方Many children use the Internet to get useful knowledge and information, and to relax in their free time. But some of them are not using in a good way. Here are some rules to make sure you are safe and have fun on the Internet.●Make rules for Internet use with your parents. For example, when you can go online, for how long and what activities you can go online.●Don’t give your password(密码) to anyone else, and never leak out the following information—your real name, home address, age, school, phone number or other personal information.●Check with your parents before giving out a credit(信用) card number.●Never send a photo of yourself to someone in e-mail unless your parents say it’s OK.●Check with your parents before going into a chat room. Different chat rooms have different rules and attract different kinds of people. You and your parents must make sure it’s a right place for you.●Never agree to meet someone you met on the Internet without your parent’s permission(允许). Never meet anyone you met online alone.●Always remember that people online may not be who they say they are. Treat everyone online as strangers.●If something you see or read online makes you uncomfortable, leave the site. Tell a parent or teacher right away.●Treat other people as you’d like to be treated. Never use bad language.●Remember—not everything you read on the Internet is true.【小题1】The underlined phrase “leak out” in the third paragraph may mean “________.”A．赠送B．泄漏C．分发D．整理【小题2】 It’s good for children to ________ on the Internet.A．give password to othersB．get useful knowledge and informationC．give out a credit card numberD．go into a chat room as they’d like to【小题3】If your parents don’t agree, never ________.A．read anything on the InternetB．relax in your free timeC．have a face-to-face meeting with anyone you met onlineD．treat other people as you’d like to be treated【小题4】This passage is mainly about “________”.A．How to Use ComputersB．Surfing on the InternetC．Information on the InternetD．Internet Safety Rules