1. 高速行驶是这次事故的主要原因。
______________________________ was the main cause of the accident.
2. 你爸爸去北京出差多久了?
______________________________?
3. 王先生离开常州有一个星期了。
Mr Wang ______________________________.
4. 米莉不在这儿。她去博物馆了。
Millie isn't here. She ______________________________.
5. 结婚以来，他们已经去过很多名胜古迹了。
They ______________________ many places of interest ______________________.

1. Driving at high speed
2. How long has your father been in Beijing on business
3. has been away from Changzhou for a week
4. has gone to the museum
5. have been to; since they got married

The Horsetail Fall (瀑布) is one of Yosemite National Park's most amazing views. Around the second week of February, the setting sun hits the Horsetail Fall at just the right angle (角度) to light the upper parts of the waterfall. And when conditions are right, the Horsetail Fall becomes orange and red at sunset. It is like red - hot lava (熔岩) pouring down from the top of the El Captain. So, it got the name “firefall”.
The firefall is a perfect match of the weather, the fall, the time and the watching place. It usually comes out on dry, warm and cloudless days. There must be enough flowing (流动的) water to make a firefall too. So there must be enough snow on the mountain top, and it turns into water on warm afternoons.
The sun goes to the best place before the fall in late February. And the best time to watch the fall is 5 to 15 minutes before the sunset. Only at this time can visitors see the firefall. The El Captain Picnic Area is the best place to watch it, because it is close to the fall and is perfect to set up cameras and tents.
Every year in February, thousands of photographers come to watch the firefall. The view may come out just minutes before sunset, but many of them have to come hours earlier to get a right place to set up their cameras in time. “I'm just saying that the Yosemite Firefall is something you don't want to miss during the winter,” says Kate Moore, a traveller and the lead content creator for ParkedInParadise.com.
( ) 1. Paragraph 1 mainly tells us ________.
A. how the firefall got its name
B. why it's easy to see the firefall
C. who was the first to find the firefall
D. on which day we can visit the firefall
( ) 2. What can we know about the firefall?
A. It lasts for half an hour before the sunset.
B. It usually comes out on wet, warm and cloudy days.
C. Rivers provide enough flowing water to make a fall.
D. Its best watching place is the El Captain Picnic Area.
( ) 3. From the words of Kate Moore, we can infer (推断) that ________.
A. the firefall is worth(值得) seeing
B. it's dangerous to watch the firefall
C. the firefall brings little surprise
D. it's a waste of time to visit the firefall
( ) 4. What's the theme of the passage?
A. Art.
B. Nature.
C. Science.
D. History.

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