Hello everyone! I'm Lucy. My parents love travelling with me. We have been in Australia____ three days. We're having a ____ time here. Australia is ____ sixth largest country in the world. There is too much to see. And it is impossible for me to tell you ____. Sydney is a beautiful city. There are both many trees ____beautiful flowers around the houses and they look really beautiful. There are also some special ____ in Australia, such as kangaroos and koalas. They are really lovely.

    During the past three days, we've visited many ____ of interest around Sydney. I'd like to spend more time here, but we will fly to ____city, Cairns, to see coral reefs(珊瑚礁) tomorrow. People say that words cannot tell the beauty of the colorful coral. Many famous cartoon films were made there. Now we are busy packing our bags. We will enjoy____ in Cairns this time tomorrow. I'm looking ____ to going there!

“$m>n>0$”是“方程$m{x}^2+n{y}^2=1$表示焦点在y轴上的椭圆”的（  ）

在奥运赛场上，马拉松赛道上每隔一段距离就会设立喷雾降温设备为运动员降温，防止运动员因体温过高而出现意外．剧烈运动中，运动员的体温会升高的根本原因是（　　）

He watches TV____ ____ three times a week.   

—I think students should have mobile phones to call their parents.

—________. They often use them to play games instead.