问题
选择题
人在发烧时食欲较差，其病理是（ ）
A．胃不能及时排空
B．摄入的食物未能被消化
C．消化酶活性受影响
D．完全抑制了消化酶的分泌
答案
食物的消化需要消化酶的参与，而消化酶的活性受温度的影响：低温和高温都会抑制消化酶的活性；人体在37℃时消化酶的活性最强．当发烧时，过高的体温抑制了消化酶的活性，影响体内的食物的消化，因而食欲较差．
故选：C
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人在发烧时食欲较差，其病理是（ ）
A．胃不能及时排空
B．摄入的食物未能被消化
C．消化酶活性受影响
D．完全抑制了消化酶的分泌
食物的消化需要消化酶的参与，而消化酶的活性受温度的影响：低温和高温都会抑制消化酶的活性；人体在37℃时消化酶的活性最强．当发烧时，过高的体温抑制了消化酶的活性，影响体内的食物的消化，因而食欲较差．
故选：C
| 阅读理解。 | ||||||
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| 1. How many important events did they talk about? | ||||||
| A. Six. B. Four. C. Three. D. Five. | ||||||
| 2. When the earthquake happened, Ted was ________. | ||||||
| A. waiting at the station B. walking in the park C. visiting his grandpa in the hospital D. having dinner | ||||||
| 3. ________ was chatting in the living room when the opening ceremony of the Olympic Games began. | ||||||
| A. Nicole B. Kathy C. Alice D. Jackson | ||||||
| 4. China's "Shenzhou Ⅶ" spacecraft returned successfully (成功地) on ________. | ||||||
| A. September 28th, 2008 B. August 26th, 2005 C. October 17th, 2005 D. August 8th, 2008 | ||||||
| 5. Which of the following is true? | ||||||
| A. The Wenchuan earthquake happened in our country in 2007. B. Kathy was playing chess when the opening ceremony of the Olympic Games began. C. The opening ceremony of the Olympic Games began on the morning of August 8, 2008. D. When Shenzhou Ⅶ spacecraft returned, Erin was excited. |