问题
选择题
Some of the students have already learned enough English to __________ a conversation with a native
English speaker.[ ]
A．carry on
B．keep on
C．go on
D．hold on
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Some of the students have already learned enough English to __________ a conversation with a native
English speaker.[ ]
A．carry on
B．keep on
C．go on
D．hold on
答案：A
某实验小组探究酒精对水蚤心率的影响，下列数据是在清水和不同浓度酒精溶液中测得的水蚤心跳次数（10秒内）．分析表中数据，你认为酒精对水蚤心率有何影响（ ）
| 清水 | 酒精溶液 | |||||
| 1% | 18 | 10% | 15% | 20% | ||
| 10 秒内心跳次数 | 33 | 30 | 24 | 21 | 18 | 0 |
A．具有促进作用
B．先抑制后促进
C．具有抑制作用
D．没有影响