问题 填空题

在氢氧化钡稀溶液中滴入2~3滴酚酞试液,出现红色,放置一段时间后,红色消失.请你对此现象进行合理的解释______.

答案

有与氢氧化钡溶液在空气中会与二氧化碳反应生成碳酸钡沉淀和水,所以溶液的碱性会慢慢消失,红色就会褪去.

故答案为:碱性溶液会使酚酞变红,稀的氢氧化钡会与空气中二氧化碳反应生成碳酸钡沉淀和水,使溶液碱性消失,红色褪去.

阅读理解

Canada, the world’s second-largest country, has a massive Atlantic coastline (海岸线). So, the best way to experience it is by car.

★ One week

Cross over to Wolfville and the Bay of Fundy via HWY 12. Spend a day criss-crossing the country roads and grassy hills of Cape Blomidon to catch some of the most impressive views of the Fundy tides (潮水).

The next day, drive east, stopping at wineries (酿酒厂) and shopping for unique jams and other local foods at Tangled Garden, where you can also cool down with a herb-flavored ice cream.

Drive through the rural roads and maybe get lost on the way to Maitland to sign up for a day of white-water rafting, which can be relaxing and one of the most exciting experiences in your life.

On the last day, head back to Halifax via east coast Martinique Beach, one of the longest beaches in Nova Scotia, a beautiful place for stretching legs and bird watching.

★ Two weeks

With more time, you can go directly up to Cape Breton, along the circuitous (迂回的) roads of the “Cabot Trail”, over high sea vista points, where you have to watch for moose (驼鹿) on the road.

Those with more time can go to Newfoundland and continue on the “Viking Trail” that links the Gros Morne National Park with Leif Eriksson’s historic Viking settlement.

★ When to go

Outside of June to October the coast will be extremely cold and most businesses will be shut.

★ Where to stay

● Lennox Inn 1791 (Lunenburg): Canada’s oldest continually operating hotel.

● The Olde Lantern Inn & Vineyard (Grand Pre): in the heart of winery and Fundy tide country.

★ Where to eat

● Fleur de Sel (Lunenburg): widely considered this coast’s finest restaurant.

● Hall’s Lobster Pound (Hall’s Harbour): pick your lobster, get it boiled and enjoy it on a park bench.

小题1:If choosing the one-week tour, you are advised to start from       .

A.Wolfville

B.Maitland

C.The Bay of Fundy

D.Halifax小题2:If you intend to go for a drive along the coast in Canada, you should go there       .

A.in January

B.in May

C.in July

D.in November小题3:We can infer from the passage that       .

A.white-water rafting is quite exciting

B.moose can be seen in large numbers in Newfoundland

C.people can be easily lost along the roads of the “Cabot Trail”

D.Lennox Inn 1791 is Canada’s oldest hotel

问答题 简答题