问题
选择题
— He is crazy about computer games.
— It isn't surprising _______ he isn't doing well in his study recently. [ ]
A. whether
B. that
C. why
D. what
答案
答案：B
搜题请搜索小程序“爱下问搜题”
— He is crazy about computer games.
— It isn't surprising _______ he isn't doing well in his study recently. [ ]
A. whether
B. that
C. why
D. what
答案：B
从“特殊推向一般“是学习化学的一种方法．下列推理正确的是（ ）
| 编号 | 特殊结论 | 一般结论 |
| A | 单质由一种元素组成 | 由一种元素组成的物质一定是单质 |
| B | 硫酸属于酸溶液，能使石蕊变红 | 能使石蕊变红色的都是酸性溶液 |
| C | 水是由分子构成的 | 所有物质都是由分子构成的 |
| D | 氯化钠属于盐，其溶液pH=7 | 所有盐溶液的pH都等于7 |
A．A
B．B
C．C
D．D