This was the first time that Chongqing the Listening Examination of Public English Test System II (PETS-2). A. has joined B. joined C. will join D. had joined 答案:D科研人员用茶树离体叶片测定了气孔导度(指单位时间、单位面积叶片通过气孔的气体量)、净光合速率的变化,结果如下图所示。下列说法错误的是( )A.实验开始4min时,水光解产生气体的去向有进入线粒体和释放到细胞外B.若茶树植株长期处于16min时的状态,则其不能正常生长C.与8min时相比,4min时叶绿体中的ADP、NADP含量较少D.在最初0~4min内,叶肉细胞净光合速率下降的主要原因是气孔导度的下降,阻止了CO2的供应