人教版（2019）选择性必修二高中英语Unit 4Journey Across a Vast Land Section B Learning About Language同步练习-组卷题库站

Since I was born and brought up in a rural town, I have a great interest in nature. Using the chance of study abroad in my second year at college, I decided to go to Canada just because I wanted to see the beautiful phenomena there. So after I finished the study abroad program, I went to Yellowknife in the North West Territories.

I clearly remember the sixth night in the Yellowknife. Suddenly my host mother came to my room around 8 p. m. and told me to change clothes and go outside quickly carrying her camera.

The"northern lights"were flickering in the sky!I was stunned and just stood there with my mouth open. I forgot to take pictures of the mysterious lights.

I was so excited that I couldn't sleep at all that night. Since that night, whenever it was sunny, I went outside at night and looked at the sky. It was so cold that I lost all feelings in my hands and feet. Actually, the time of my being able to be out was limited. I had to bring her camera back to house in one hour at the most, for the camera was going to be broken because of the cold temperature.

As I took the pictures of the northern lights, I came to find a characteristic movement of the lights. They first appear in the north part of the sky and then they gradually come down to the south part of the sky. After that, suddenly, they come in the middle of the north and south only for a while, which is the time when the best northern lights can be seen. Since it is only a few seconds for the northern lights to come down to the middle of the sky, it is very hard to get good pictures.

The stronger the sun acts, the better and strong northern lights flicker in the sky. That's because they occur from the collision between atmospheric gases and solar wind. Much more solar wind comes to the earth when the sun is active, which lead to the best northern lights. And the colours of the northern lights depend on the height of the collisions and kinds of gases.

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How to protect your privacy when you travel

It hasn't been an easy year for the privacy of travelers, at least so far. Data leaks, surveillance(监视)worries and those troublesome cameras in airplane seatbacks and hotel rooms are enough to make passengers anxious. Fortunately, there are ways to safeguard your privacy on land and in the air. These tips can help you deal with these troubles.

"It's not clever to declare on Facebook that you're traveling to somewhere, reminding a wide range of people that your property is sitting empty, "says Danny McLoughlin. "That puts your security at risk. "Wait until you return to start posting vacation photos.

Some homeowners renting their residences may install security cameras. Travelers should find out if the hosts are required to disclose the presence of surveillance devices. If the rental comes with cameras, ensure they aren't in a sensitive area by conducting a careful sweep.

Although you can't control how a hotel or airline handles—or mishandles—your data, you can take reasonable steps to ensure the information it has won't get you into trouble. But some of the worst data leaks happen when you're staying at a hotel. For example, a hotel clerk sometimes asks for your name and then announces your room number after you've checked in. You're better off handing the employee your ID when he or she asks for your name and asking him/her to write your room number on a piece of paper. Why? Just to be sure, never leave the customer copy behind. You can destroy it later, but keep it under your control.

A. It's never been better.

B. Perhaps they should be.

C. Travelers say they're taking privacy seriously.

D. Never broadcast your journey on social media.

E. There are other people on the other side of the wall.

F. Some travelers only offer the bare minimum, such as a P. O. box instead of a home address.

G. Report anything doubtful to the host immediately—and if you don't like what you hear, leave.