心脏听诊，先从哪里开始()。
A．心尖区
B．肺动脉听诊区
C．二尖瓣区
D．三尖瓣区
E．主动脉瓣区
参考答案：A
解析：[知识点] 心脏视诊
Look and write. (根据提示，在横线上填写单词，完成短文。)
Hello, boys and girls! Nice to meet you! I'm Tim. I have a farm. It's very big. There are many
animals on the farm. 1.__________(12头) cows, 30 2.__________(兔), 45 3.__________
(鸭子), 23 4.___________(猪), 5.____________(20匹) horses. I like my farm. Welcome to
my farm.
______ my pen pals. [ ]
A. This is
B. That is
C. These are
D. Those are
