1 . 单句语法填空
(1) (2018·全国Ⅰ)The review says it is more effective at lengthening life__________ walking, cycling or swimming.
(2)(2016·全国Ⅲ)Over time,__________ the population grew, people began cutting food into small pieces so it would cook more quickly.
(3)(2018·全国Ⅱ)Corn uses less water__________ rice and creates less fertilizer(化肥) runoff.
(4)(2016·四川)It was time for her to have a new baby,__________ it was also time for the young panda to be independent.
(1) (2018·全国Ⅰ)The review says it is more effective at lengthening life
(2)(2016·全国Ⅲ)Over time,
(3)(2018·全国Ⅱ)Corn uses less water
(4)(2016·四川)It was time for her to have a new baby,
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