预防医学研究的人类环境属于下列何种（） A.人类的城市环境 B.人类的农村环境 C.

SE序列出现下列哪项提示肺动脉高压（）

A.T₁WI主肺动脉内出现血流高信号

B.T₁WI主肺动脉内出现血流低信号

C.T₁WI主肺动脉内出现血流无信号

D.T₁WI主肺动脉内出现血流混杂信号

E.T₁WI主肺动脉内出现血栓无信号

阅读理解。

美丽的大海

       去年春天，我和爸爸妈妈一起去了北戴河。我们来到海滩上，举目远望，只看见无边无际的大海和蓝天相连，阳光下的海面碧蓝碧蓝的。雪白的浪花像是给大海镶了一道银边。 

       我和爸爸走在柔软的沙滩上。眼前，层层细浪一次次抚摸着沙滩。浪花追着浪花，拍打着我的小脚丫。我感到是那样的凉爽、舒畅。金色的沙滩上还散落着五光十色的贝壳，有的圆，有的扁，有的像天上的星星，有的像地上的花朵。海滩上，人们有的在游泳，有的在晒太阳，孩子们用沙子堆了一个大大的城堡，欢乐的笑声在我耳边回荡。   

       大海的景色真美啊！我爱美丽的大海。

1．这篇短文有____个自然段，是紧紧围绕第____自然段来写的。

2．“我”来到大海，看到了____     的大海、____      的海面和                的贝壳；听到了____的笑声；感受到了                和                       。 

3．读了这篇短文，你最喜欢哪句话，用“           ”标出，并说说为什么喜欢？

以下有关婴儿期的预防接种，正确的是：()

A．2～3个月接种卡介苗

B．2个月开始口服脊髓灰质炎疫苗

C．4～5个月注射麻疹疫苗

D．8～10个月注射流脑疫苗

E．1岁注射百白破三联疫苗

断裂构造是指煤层在力的作用下，产生的断裂，失去连续性和完整性而出现的构造。（）

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

（19）（）

A.blunder

B.temptation

C.break

D.trait