两个容器中分别盛有甲、乙两种不同的液体，把体积相同的A、B两个实心小球放入甲液体中，两球沉底；放入乙液体中，两球静止时的情况如图乙所示．则（　　）

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澳大利亚国徽上的两种特有动物是____ 和____ ．

1945年，面对国民党政府出卖国家主权，人民悲愤地说：“撵走一只狼，请来一只虎。”这里的“狼”和“虎”分别指的是(    )

“七八个星天外，两三点雨山前。”这两句用对偶的手法写出了夏夜特有的景象。

—What seems to be the problem?

—____

—How long have you been like this?

—Since Saturday night.

—____ 

—Yes, I also feel lighthearted.

—Can you think of anything you ate Saturday that might have caused it?

—All I can think of is the fish I had. It didn't taste quite right.

—____  Now I'll give you some medicine. Take it and you should be feeling better soon.

—____

—I also suggest that you follow a special diet.

—____ 
—You should stick to eating lighter foods.

A:What's that?

B:That might be it.

C:Thank you, doctor.

D:Any other problems?

E:I have a running nose.

F:Have you seen a doctor?

G:I have a terrible stomachache.