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问题 填空题

正常人胃液的pH约在______之间，如胃酸过多会导致胃病，治疗胃酸过多的药物含有______，该物质与胃酸反应的方程式为______．

答案

胃液pH为0.9～1.5之间，胃酸过多，可服用含氢氧化铝的药物，氢氧化铝显弱碱性，能中和胃液中的盐酸，化学方程式为：Al（OH）3+6HCl=2AlCl3+3H2O

故答案为：0.9-1.5；Al（OH）3；Al（OH）3+6HCl=2AlCl3+3H2O．

单项选择题

某工程双代号网络计划如下图所示，其关键线路有（）条。

A.1

B.2

C.3

D.4
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单项选择题

Many students have hobbies, such as reading, painting, growing vegetables in their gardens, and looking after animals. Some hobbies are relaxing and (16) are creative. Hobbies can develop your interests and help you learn new skills.
David Smith is a student, and his hobby is writing. (17) the sumer of 2000, he spent four weeks on a summer camp. As well as the usual activities, such as sailing, climbing and mountain biking, there was a writing workshop with a professional (18) "She asked us to imagine that we were in a story. Then we wrote about our (19) at the camp. "
In senior high school David wrote a story about teenage life, and it (20) as a book in 2003. Many teenagers love his book, and as a result, David has become a (21) young writer.
David has been very lucky (22) his hobby has brought him enjoyment and success, but he is (23) interested in many other things. "I like playing volleyball, too" says David. "I spend some of my free time playing volleyball for my school team. (24) I’ll write more books in the future, but I’m not sure. "
It’s sometimes difficult (25) that we shouldn’t spend all our time on our favourite hobby. There are many other interesting things to do in life, and we should try to do something new or different.

Ⅱ. 完形填空/Cloze

A．remember

B．remembers

C．remembered

D．to remember
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