题目内容：

    The Grand Canyon (美国大峡谷) is an unfolding mystery. No photograph, however stunning, can do justice to the Grand Canyon. No account, however expressive, can describe it in sufficient detail. To appreciate its marvel, you must see it for yourself. To get you started on your journey, here are several things you’ll want to know before you go.

Crowds

About 6 million people visit the Grand Canyon each year. Fortunately, the park is spread over about 2,000 square miles, so there’s plenty of chance for peace and privacy. There are several ways to avoid the crowds. First, visit the park in spring, fall or winter. Second, avoid the busy South Rim in favor of the more peaceful North Rim. Remember, about 12 people die each year in the Grand Canyon. Causes of death include drowning, falling, overheating and “killfies” — selfie-related deaths.

Internet and cellphone

There is spotty internet and cellphone coverage in the North Rim and South Rim visitor centers and in some of the larger hotels, including El Tovar and Grand Canyon Lodge. But if you venture inside the canyon and wander in places such as Tuweep Campground, assume you’ll be isolated. Always inform a friend or family member about where you’re going and for how long.

Railway

Since the late 1800s, the Grand Canyon railway has carried passengers from Williams, Arizona to the South Rim’s train station. It’s a pleasant ride through Ponderosa pine forests and wide-open grasslands. You won’t see the canyon from the train.

Skywalk

In 2007 the Hualapai tribe (部落) approved the construction of Skywalk, a bridge with a glass walkway sticking out 70 feet into the canyon, at Eagle Point in Grand Canyon West. Tickets start at $69 per person, which includes shuttle bus service and access to Guano Point, Eagle Point and Hualapai Ranch viewpoints.

1.According to the passage, when is the busiest season for the Grand Canyon?

A.Spring. B.Summer.

C.Autumn. D.Winter.

2.Cellphone signals can be picked up in the following places EXCEPT ________

A.Visitor centers. B.El Tover.

C.Grand Canyon Lodge. D.Tuweep Campground.

3.How can you enjoy the view of the Grand Canyon to the fullest?

A.By visiting South Rim when it is hot and sunny.

B.By posting selfies on social media websites while visiting.

C.By taking the pleasant train ride across the canyon.

D.By walking on a glass walkway at Eagle Point.