2001年5月 34、The carbon-are lamp, a very bright electric lamp used for spotlights, consists of two carbon electrodes with a high-current are passing between it. the key: D 那它的意思就是把it--->them指代electrodes了,但是不改C句子的结构怎么解释呢? 2002年1月 10、One of the basic principles of wildlife conservation involves_______adequate natural food and shelter to maintain populations of each species in a given habitat. a.the provision b.that provision c.to provide d.providing the key: d 这道题的考点是什么?