题型：问答题 简答题 阅读短文，用方框内的单词的适当形式填空。watch learn be have Chinese Dick and Ellen come from America. Now they ___1___ in Tianjin. Every morning they get up very early. Then they go to work by car. They start their work at 8:30. They are very busy. They ___2___ lunch at 12:30. After lunch they work again. They finish their work at 5:30 p.m. In the evening Dick takes Chinese lessons because he wants ___3___ Chinese. Ellen stays at home and ___4___ TV. They like totalk with Chinese people. They often say "Chinese people are very friendly". They like to stay in __5___ and they like to work with Chinese people. 查看答案
题型：问答题 简答题 短周期元素X、Y、Z和W的原子序数依次递增，且在同一周期，四种元素原子的最外层电子数之和为19，X和Y元素原子的原子序数比6：7，X的最高正价是W的最低负价的绝对值的2倍。下列说法正确的是（ ）A．X单质可以通过铝热法获得B．Y的氧化物是良好的半导体材料C．Z的氢化物比W的氢化物更稳定D．X的最高价氧化物和Z的最高价氧化物化合的产物中有共价键和离子键 查看答案
题型：问答题 简答题 化脓性脑膜炎患儿，脑脊液变化最多见于（）A.白细胞数增高，蛋白增高，糖、氯化物减少B.白细胞数增高，蛋白、糖正常，氯化物减少C.外观清亮，压力降低D.外观浑浊，压力正常E.外观清亮，压力升高 查看答案