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问题 单项选择题

诊断前置胎盘的最常用的准确的辅助检查方法是（）

A.A型超声示波法

B.B型超声断层法

C.放射性同位素扫描定位

D.间接胎盘造影

E.腹部检查

答案

参考答案：B

选择题
已知等比数列{an}中，a1+a2+a3=40，a4+a5+a6=20，则前9项之和等于

A.50
B.70
C.80
D.90
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填空题

根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。

1. The Y______River is the second longest river in China, and it is also called "Mother River of  China".

2. Her story broke my h_______and I felt very sad.

3. The work doesn't s_______me fine.I can't do it.

4. I e_______I will get good grades in the next exam.

5. My parents always ask me not to tell lies and be an h_______child.
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