听力原文：M: I'm so tired I can't see straight.W: You've been tired a lot lately, haven't y

听力原文：M: I'm so tired I can't see straight.

W: You've been tired a lot lately, haven't you？

M: Well, over the last weeks I'ye had to stay up most of the night to to observe star configurations for a project for my astronomy class. It's awful, no matter what time I go to bed I always wake up at 6 A. M. That's the time I usually get up.

W: Your biologyical rhythms probably haven't adjusted to your new schedule. I've read what some people have a lot of trouble when their sleep rhythms are interrupted. Even sleeping pills don't help them

M: I know, in fact, I'ye heard that there are now several special treatment centers for sleep disorders across the country. Some people sleep too little, some sleep too much, some walk in their sleep.

W: I'd like to find out how to treat problems like that, Maybe you should go to one of those centers.

M: Not me! After next week, my project will be finished, and I'll go back to my regular hours. Now I know for sure that to be don't want to be an astronomer.

What has the man not been able to do recently？

A．Find his glasses.

B．Sit up straight.

C．Get enough rest.

D．Change his tires.