问题
选择题
向某无色溶液中滴入无色酚酞试液后不变色，向该溶液中滴入紫色石蕊试液则( )
A．一定显红色
B．可能仍为紫色，也可能显红色
C．一定显无色
D．可能显蓝色
答案
答案：B
无色溶液加入酚酞试液后不变色，说明该溶液是酸性溶液或中性溶液，酸性溶液能使紫色石蕊试液变红色，中性溶液不能使紫色石蕊试液变色，仍为紫色。所以本题选B。
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向某无色溶液中滴入无色酚酞试液后不变色，向该溶液中滴入紫色石蕊试液则( )
A．一定显红色
B．可能仍为紫色，也可能显红色
C．一定显无色
D．可能显蓝色
答案：B
无色溶液加入酚酞试液后不变色，说明该溶液是酸性溶液或中性溶液，酸性溶液能使紫色石蕊试液变红色，中性溶液不能使紫色石蕊试液变色，仍为紫色。所以本题选B。
| 阅读短文, 从ABCD 选项中选择最佳答案. | |||
| Kate___1___from America . She is America . She __2_____ English .She can also speak ___3___Chinese .She ___4__ in Beijing now . She __5___ in a middle school . She ___6___ classes ___7___ weekends . She often goes to school ___8___ . She often helps her mother go shopping ___9___ Sundays . Her father __10____ in Beijing .He __11____ English . Her mother also __12____ in Beijing . They __13____ Chinese food , and __14____like China . TheChinese people are __15____ to them . | |||
| ( ) 1. A. come ( ) 2. A. speak ( ) 3. A. little ( ) 4. A. is ( ) 5. A. study (学习) ( ) 6. A. have ( ) 7 A. on ( ) 8. A with bus ( ) 9. A. on ( ) 10. A. work ( ) 11. A. teacher ( ) 12. A. works ( ) 13. A. like ( ) 14. A. he ( ) 15. A. friend | B. are B. says B. many B. are B. is studying B. has B. in B. on the bus B. in B. working B. teaches B. working B. likes B. she B. friends | C. comes C. talks C. few C. be C .studies C. having C. at C. at the bus C. at C. works C. teaching C. work C. liking C. their C. good | D. be D. speaks D. a little D. am D. are studying D. haves D. to D. to the bus D. for D. doesn't work D. to teach D. to work D. are D. they D. well |