单项选择题 Each of the measuring intruments that will be used to collect data from the subjects should be described in detail and a rationale should be given for their use.  A、正确 B、错误

单项选择题 With the money he got，first Hobbs________．A.planned to have a happy life for a few daysB.decided to give up his work in the officeC.was to give a dinner to his friendsD.had no idea what to do

单项选择题 完成下列各题 C 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 fiver trip though the Canyon on the Colorado River． Visitor services and facilities inside the national park on the Noah 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． What do we learn from the passage about the South Rim?A.It is lower than the Noah Rim．B.It is hard to get，to even in good weather．C.It is not open in winter months．D.It attracts over。five million visitors each year．