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问题 选择题

已知命题p：若m＞0，则关于x的方程x2+x-m=0有实根．q是p的逆命题，下面结论正确的是（　　）

A．p真q真

B．p假q假

C．p真q假

D．p假q真

答案

P：当m＞0时，△=4+4m≥0，此时方程x2+x-m=0有实根，故p为真命题

q：p的逆命题：若x2+x-m=0有实根，则△=4+4m≥0，解可得m≥-1，q为假命题

故选：C

改错题

短文改错。

Last winter vacation,some of my classmates decide to

                                                            1._________

travel with their friends, while I chose to take part-time

job                                                        2._________

to gain experience and earn some money. I learn from

my                                                         3._________

teacher that a nearby company was looking after students

                                                             4.__________

with good handwriting to write addresses on envelope. The

                                                              5._________

pay were 10 cents per envelope. I headed for the company,

                                                             6.__________

feeling sure l would easy finish 300 envelopes in five hours

and                                                       7._________

to earn the money. Actually,I only finished 200. Now, I

                                                             8.__________

fully understand how hard is to earn money. Getting out

                                                             9.__________

of the classroom is indeed necessary for we all.

                                                              10._________
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单项选择题

下列选项中，不是一个算法的基本特征的是( )。

A．完整性

B．可行性

C．有穷性

D．拥有足够的情报
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