听力原文:M: I'm worried about Anna. She's really been depressed lately. All she does is staying in her mom all day. W: That sounds serious. She'd better see someone at the Counseling Center. Q: What does the woman suggest Anna do? (16)
A.
Stop worrying.
B.
Go out more.
C.
Talk to a friend.
D.
Get counseling.
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【单选题】图示机构中,直角形杆 OAB 在图示位置的角速度为 w ,其转向为顺时针向。取小环 M 为动点,动系选为与直角形杆 OAB 固连,则以下四图中的动点速度平行四边形,哪一个是正确的( )