心室肌的有效不应期可一直持续到( )A．收缩期开始B．收缩期中间C．舒张期开始之后

B淋巴细胞能特异性识别抗原的受体是（）

A.E受体

B.IgGFc受体

C.C3受体

D.mIg受体

E.IgEFc受体

Today, due to numerous medical and scientific advances, people are living longer than ever before. But you have to be good to your body, mind, and soul. The following tips are a good start for getting you on your way to living a long and healthy life.

Eat a balanced diet -- one that is rich in fruits, vegetables, whole grains, and fiber and low in saturated fat, trans fat, and cholesterol. A well-balanced diet can provide your body with the essential nutrients needed to achieve and maintain optimum (最佳的) health.

Be physically active -- try to incorporate 30 minutes of activity into your day, every day. The options are endless; start walking on the beach in the mornings, try jogging with a friend, or go for a bike ride in the afternoons. Make sure you choose activities that you enjoy, so that you'll be more likely to make them a habit.

Get regular preventive check-ups --see your doctor regularly; remember your doctor is your partner in health care. By having regular check-ups, you may be able to catch small problems before they become big ones.

Be safe - use common sense and be streetsmart (适应都市生活的). Don't put yourself in situations that are questionable. Always wear your seatbelt and bike helmet. Don't go for a run,   walk, or jog at night by yourself. Keep your home well lit and free of things that could make you fall.

Stay in touch with family and friends -- get to know your neighbors. Take the time to be involved with your community. By creating a strong social network, you will not only have friends to celebrate with when good things happen, but also a support system in difficult times.

Keep a positive attitude -- studies have shown that people who have a positive attitude tend to live longer, and lead healthier and happier lives. Try to find the humor in life. And remember to laugh.

小题1:What would be the best title for the passage?  (No more than 10 words.)

______________________________________________________________________________

小题2:Please explain the underlined word “tips” in English (No more than 5 words) 

_______________________________________________________________________________

小题3:Why do we need to get regular check-ups? ( No more than 10 words.)

_______________________________________________________________________________

小题4:What should you pay attention to when doing activities? ( No more than 15 words.)

_______________________________________________________________________________

小题5:What should you do to keep a positive attitude? ( No more than 10 words.)

_______________________________________________________________________________

P波与ORS波无固定关系，可见室性自主心律心电图表现是

A．一度房室传导阻滞
B．二度Ⅱ型房室传导阻滞
C．二度Ⅰ型房室传导阻滞
D．三度房室传导阻滞
E．窦房传导阻滞

在Internet中，负责选择合适的路由，使发送的数据分组(Packet)能够正确无误地按照地址找到目的站并交付给目的站所使用的协议的是______。

以下关于寻常型银屑病特殊部位皮损的描述正确的有（）

A.黏膜损害表现为灰白色环状斑

B.头皮损害可引起束状发

C.甲受累最多见甲横嵴和甲纵嵴

D.腋下皮损鳞屑明显增厚