Nearly five million people see Grand Canyon each year.
Most of them see it from their cars at overlooks along the South Rim. The South Rim is the easiest to reach in the park.
The South Rim is open 24 hours a day, 365 days a year. Services are provided and facilities(设施) are open year round.
A much smaller number of people see the Canyon from the North Rim, which lies just miles directly across the Canyon from the South Rim. The North Rim rises a thousand feet higher than the South Rim, and is more difficult to reach. Heavy snows close the road to the North Rim from late October to mid-May of each year. Even in good weather it’s harder to get to.
The inner canyon includes everything below the rim and is seen mainly by campers, mule（骡子）riders, or river runners. There are many opportunities here for adventurous persons who want to camp, ride a mule to Phantom Ranch, or take a river trip though the Canyon on the Colorado River.
Visitor services and facilities inside the national park on the North Rim are only open from mid-May to late October. Weather permitting, the North Rim is open for day use only, following the close of facilities in late October. During this time there are neither services nor overnight facilities. 【題組】48. From late October to mid-May, ____the North Rim.
(A) many mule riders come to
(B) heavy snows block the way to
(C) services are provided 24 hours on
(D) the weather is usually pleasant on
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