There are times when people are so tired that they fall asleep almost anywhere. We can see there is a lot of sleeping on the bus or train on the way home from work in the evenings. A man _____1_____(fold) the newspaper, and seconds later, ______2______ appears as if he is trying to eat it. Or he will fall asleep on the shoulder of the stranger _____3______ (sit) next to him. Another place where unplanned short sleep goes on is in the lecture hall  _____4______ a student will start snoring（打鼾）so ____5______(loud) that the professor has to ask another student to keep the sleeper awake. _____6_____ more embarrassing situation occurs when a student starts falling into sleep and the weight of the head pushes the arm off the desk, and the ____7______ (move) carries the rest of the body along. The student wakes up on the floor ___8_____ no memory of getting there. The worst time to fall asleep is when driving. Police reports are full of accidents that occur when people fall into sleep and go __9____ the road. If the drivers are lucky, they are not seriously hurt. When people are really tired, _10____ will stop them from falling asleep ---- wherever they are.

执行功能作用的溶酶体是（）

A.初级溶酶体

B.大泡性溶酶体

C.残余小体

D.内体性溶酶体

E.吞噬性溶酶体