问题 选择题

在试管内加入2 mL的食用油,再加入由几种等量的消化液混合配制的“X 消化液”,充分振荡后,置于37℃的温水中,观察食用油被消化的情况。让植物油最先消失的“X消化液”的组成

成分是

A.胃液、胆汁

B.胃液、胰液、肠液

C.胰液、肠液

D.胰液、肠液、胆汁

答案

答案:D

题目分析:植物油属于脂肪,脂肪只能在小肠内才能被消化.首先在小肠中胆汁的作用下,脂肪被变成脂肪微粒,加大了与消化酶的接触面积.而后再在肠液和胰液中酶的作用下,被消化成甘油和脂肪酸.

完形填空

A group of frogs were traveling through the forests, but unluckily two of them fell into a hole. The other frogs tried to help them. When they saw how deep the hole was, they cried to the two frogs,“We can’t save you.”The two frogs didn’t care and tried their best to jump up out of the hole. The other frogs kept saying that they were sure to die. Finally, one of the two frogs gave up, because he heard what the others were saying. Then he fell down and died. The other one, however, continued to jump as hard as he could, and at last he succeeded. When he got out, the other frogs asked, “Didn’t you hear us?” The frog, who had a poor hearing, explained, “I thought you were encouraging me all the time.”

The story teaches us: There is power of life and death in the tongue. An encouraging word to those who are down can help them out while a discouraging word can kill them.

Fill in the blanks according to the passage. Only one word for each blank.

While a group of frogs were traveling through the forests, two of them fell into a deep 小题1:_________. The other frogs had no ways to save them. They kept saying that the two frogs were sure to die. Hearing this, one of the two frogs 小题2:_________ and died. But the other one tried to jump as hard as小题3:________ and succeeded. Because there was something wrong with his ears, he thought the others were encouraging him. The story tells us when a person is in 小题4:___ , we should 小题5:_________him instead of discouraging him.

单项选择题