题目

下列有关化学用语使用正确的是           A．硫离子的结构示意图：           B．NH4Cl的电子式：           C．原子核内有10个中子的氧原子：           D．乙烯的结构简式C2H4  答案：C解析: 阅读下面材料，在空白处填入适当的内容(1个单词) 或括号内单词的正确形式。将答案填写在答题卷的相应位置。Let go of the problemsThere are many teenagers who have too much pressure. Last Wednesday, Mr. Trent began his psychological health class 1. holding up a glass of water. He asked the students 2.would happen if he held it up for a day. 3. student said the teacher’s arm would ache or go numb. He might have to go to hospital! All the students laughed. “But during the time, did the 4.(weigh) of the glass change?” asked Mr. Trent. “Then what caused the pain and numbness?” The students 5.(be) puzzled.“What should I do now 6.(get) rid of the pain?” asked Mr. Trent again.“Put the glass down!” said another student.“7.(exact)!” said Mr. Trent. “Life’s problems are something 8. caused the pain like this glass. Hold them for a few 9.(minute) in your hand and they seem OK. Think of them for a long time and they begin to ache. The longer you hold them, the more painful you feel.”It’s important to think of the challenges or problems in your life. But what’s even 10.(important) is to put them down at the end of every day.