题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 It's normal to wake briefly during the night. But if you're waking up during the night and having trouble falling back asleep, the following tips may help. Stay out of your head. The key to getting back to sleep is continuing to prepare your body for sleep, so remain in bed in a relaxed position. Hard as it may be, try not to stress over the fact that you're awake , because that very stress and anxiety encourage your body to stay awake.If you are finding it hard to fall b18．四个电解装置都以Pt做电极，它们分别装着如下电解质溶液进行电解，电解一段时间后，测定其pH变化，所记录的结果正确的是（　　）ABCD电解质溶液HClAgNO3BaCl2KOHpH值变化减小增大变大不变A．AB．BC．CD．D