A:能使紫色石蕊试剂变红的溶液中:NO3﹣、I﹣、Ba2+、Fe2+
B:含有大量Fe3+的溶液中:SCN﹣、I﹣、K+、Br﹣
C:pH=1的溶液中:K+、Br﹣、SO42﹣、Al3+
D:澄清石灰水中:Na+、K+、CH3COO﹣、HCO3﹣
在开展呼吸作用的实验研究之前,小雨根据生物学知识指出:“人体呼吸时,呼出的气体中可能比吸入的气体含较多的水蒸气”.这在科学研究环节中属于( )
—Your bike was broken. Were you late for class this morning, Linda?
—No. Luckily, Mr. Green passed by and .