1 . Are you a fan of outdoor adventures? Do you enjoy scenic views to relax? Look no further, as the following destinations offer all that and more.

Athabasca Falls

Alberta, Canada

Water from the Canadian Rockies flows down into the waterfalls of Jasper National Park, creating a flow with wild energy. The falls are wheelchairs accessible, with a paved path taking admirers to a number of viewpoints. If visitors leave the path, they can explore both the upper and lower regions of the trail.

Akaka Falls Trail

Hakalau, Hawaii

A short half-mile hike is big on sights and low on hard activity. The well-kept ring like trail guide visitors around to see a number of waterfalls, including the 442-foot main attraction, and beautiful local flora (植物群) among the famous landscape. Though there are no hills to climb, there are a number of stairways to go.

Nugget Falls

Juneau, Alaska

Located in Tongass National Forest about 12 miles from Juneau, the Mendenhall Glacier has produced Nugget Falls, a fan-like waterfall that leads into a lake. A series of short hikes allows for different views of the waterfall and icy surrounds, which are also known for frequent brown bear sightings.

Yosemite Falls

Yosemite Valley, California

Yosemite National Park is one of the oldest national parks in America and home to the fifth tallest waterfall in the world. Hikers can reach it by taking a 1-mile trail from the lodge or the 7.2-mile round-trip Yosemite Falls Trail route. Late spring is best, with the highest water flow. In the winter, the temperatures dip below freezing. A park admission fee applies.

1. Where can visitors expect to see frequent brown bear sightings?

A．Athabasca Falls.

B．Akaka Falls Trail.

C．Nugget Falls.

D．Yosemite Falls.

2. Which season is best for visiting Yosemite Falls?

A．Winter.

B．Spring.

C．Summer.

D．Fall.

3. Where can this text probably be found?

A．In a travel magazine.

B．In a novel.

C．In a history book.

D．In a diary.

2 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Placed among the busy streets of Washington, D. C. is a large public garden that many Americans have never heard of. The U. S. National Arboretum (植物园) includes     1     collection of flowering plants called azaleas, a field of native plants named ferns, and flowering trees in the dogwood tree area. The garden     2     (establish) by Congress in 1927. It plays a leading part in researching and developing plants like trees, shrubs, flowers, and grasses.

Government scientists are in charge of the 180-hectare area. Their main goal is     3    (strengthen) the U. S. economy by making sure an important kind of agriculture,     4     (call) the nursery industry, continues to perform well. The most recent numbers from the U. S. Department of Agriculture (USDA) show that the ornamental and landscape plant industry creates billions of founds in sales each year.

The arboretum is home to one of the     5     (large) collections of preserved seeds in the world. The National Arboretum Herbarium (植物标本)     6     (house) around 700,000 ex-ample seeds. They include seeds from plants that the USDA considers as     7    (economical) important. Scientists collect many genetically different seeds within a kind of plant from both native and non-native plants. The reason     8     collecting that data is that scientists protect plants from harmful situations like climate change, changed environments, or other new and possible risks.

While the scientists do their work, the public     9     (explore) plants is free to visit the arboretum. Though many people may not know it, the arboretum has had a hand in developing a number of plants     10     are part of American landscaping.