By improving reading skills, you can read faster and understand more of______you read．

A．that

B．what

C．which

D．Whether

史书记载：“水激轮转，众筒兜下，次第下倾于岸上……以灌稻田，日夜不息，绝胜人力。”这种提水工具最早出现于  [ ]

A．东汉

B．曹魏

C．唐朝

D．北宋