单词拼写（共 10 小题；每小题 1分．满分 10 分）
小题1:He is as s___________ as a donkey. No one can persuade him to change his mind.
小题2:By the Internet, we can c_____________ with people all over the world.
小题3: Nowadays, many tall buildings have e___________ for people to go up and down.
小题4:After the war, a new g____________ was set up for that country.
小题5: Though I haven’t met him for many years, I could r___________ him immediately when I saw him in the crowd.
小题6: If you spend more time reading your English, you can improve it r___________.
小题7: I am d__________ to change my job. No one else can change my mind.
小题8:Be
cause of global warming, there are more and more natural d___________.
小题9: Whether you will succeed or not depends on your a__________ to it.
小题10:The workers made great efforts to r_________ the people who were trapped underground.
是重要的核工业原料，在自然界的含量很低，它的浓缩一直为国际社会所关注。下面列出该原子核内中子数与核外电子数之差的数据正确的是
质子数为92，质量数为235，对于原子来说，核内的装置数等于核外的电子数，质量数等于质子数与中子数的和。所以原子核内中子数与核外的电子数的差为（235－92）－92=51.因此选项为A。