问题
选择题
The boy most of his free time computer games every day. [ ]
A. spent; play
B. spends; play
C. spent; doing
D. spends; playing
答案
答案：D
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The boy most of his free time computer games every day. [ ]
A. spent; play
B. spends; play
C. spent; doing
D. spends; playing
答案：D
测得生活中一些物质的pH如下表，下列说法错误的是（ ）
| 物质 | 肥皂水 | 食盐水 | 唾液 | 柠檬汁 | 洗涤剂 |
| pH | lO．2 | 7.0 | 6.8 | 2.5 | 12.2 |
A．食盐水是中性物质
B．肥皂水能使蓝色石蕊试纸变红
C．柠檬汁的酸性比唾液强
D．洗涤剂能使无色的酚酞试液变红