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问题 单项选择题

能正反馈激活自身分泌的胃液成分是（）。

A.盐酸

B.黏液

C.胃蛋白酶

D.碳酸氢盐

E.内因子

答案

参考答案：C

解析：胃蛋白酶和胰蛋白酶都可反馈激活自身分泌；盐酸反馈抑制自身分泌，生理状况下可防止胃溃疡；盐酸是诱发促胰液素释放的最强剌激因素。

句型转换

阅读短文，完成下列各题。

What do you do at the weekend ? Some people like to stay at home and rest. Other people think going out for a walk is good for their health. My friend Jack works very hard from Monday to Friday. At weekends he always does the same things . On Saturday he washes his car and on Sunday he takes his family to a village(村庄) far from his house. His uncle and aunt live there, so Jack goes to see them every week. They have a big farm and only one worker(工人) to help them , so they are usually very busy. Jack often asks his family to help them. The children give the animals food. Jack and his wife work in the fields（田地）. After a long hard day of work, they are very tired and hungry.So Jack’s uncle gives them a nice meal. After that about five, they drive home.简略回答问题。

小题1:What does Jack do on Saturday?_____________________.

小题2:How many workers help Jack’s uncle and aunt do the farm work? _____________________

小题3:Jack and his wife work in the fields.  (划线部分提问)

______  ______ Jack and his wife work?

小题4:Some people like to stay at home and rest.  (否定句)

Some people _________  ________ to stay at home and rest.

小题5:Jack often asks his family to help them.（一般疑问句）

________ Jack often _______ his family to help them?
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写作题

作文（60分）

十四五岁的我们有一颗敏感的心，我们在乎许许多多：一朵花的开落、一个意味深长的眼神、一句语重心长的劝勉……因为在乎，我们懂得珍惜；因为在乎，我们变得成熟……

请以“在乎”为题，写一篇记叙文。

注意：①从自身生活实际出发，记叙经历，抒写感情，发表议论；

②不少于600字。
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