题目

For each blank in the following passage there are four words orphrases marked A, B, C and D. Fill in each blank with the word or phrase thatbest fits the context.In bringing up children, every parent watches eagerly the child'sacquisition of each new skill-the first spoken words, the first independent steps,or the beginning of reading and writing. It is often tempting to hurry the childbeyond his 1 learningrate, but this can set up dangerous feelings of failure and states of worry in thechild. This might happen at any 2. A baby might be forced to use a toilettoo early, a young child might be e工业激光器所产生的热可由冷却用的水带走，如图所示，这是因为水的水流入激光器时的温度为15℃，流出时的温度为75℃．每秒钟有10g的水流经激光器则冷却水每秒钟带走________J热量．此时激光器输出光束的功率是20W，则激光器输入功率为________W．