当事人可以解除合同的情形包括( )。 A．合同内容发生变化 B．_爱下问搜题

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问题多项选择题

当事人可以解除合同的情形包括( )。

A．合同内容发生变化

B．因不可抗力致使不能实现合同目的

C．在履行期限届满之前，当事人一方明确表示或者以自己的行为表明不履行主要债务

D．当事人一方迟延履行债务致使不能实现合同目的

E．当事人一方迟延履行主要债务，经催告后在合理期限内仍未履行

答案

参考答案：B,C,D,E

解析：有下列情形之一的，当事人可以解除合同：①因不可抗力致使不能实现合同目的；②在履行期限届满前，当事人一方明确表示或者以自己的行为表明不履行主要债务；③当事人一方迟延履行主要债务，经催告后在合理期限内仍未履行；④当事人一方迟延履行债务或者有其他违约行为致使不能实现合同目的；⑤法律规定的其他情形。

选择题

下列有关细胞衰老和凋亡的说法，正确的是： [ ]

A．健康成人体内每天有一定量的细胞凋亡

B．细胞凋亡受环境影响大，机体难以控制

C．老年人头发变白和白化病都是由酪氨酸酶活性降低引起的

D．衰老细胞的染色质收缩，细胞核体积减小

完形填空

Now that I am no longer young, I have friends whose mothers have passed away. I have heard these sons and daughters say they never fully appreciated their mothers ___36___ it was too late to tell them. I am blessed with the dear mother who is still alive. I ___37___ her more each day. My mother does not change, but I ___38___. As I grow older and wiser, I realize ___39___ an exceptional person she is. How ___40___ that I am unable to speak these words in her ___41___, but they flow easily from my pen.
　　How does a daughter begin to thank her mother for life itself? For the love, patience and just ___42___ hard work that go into ___43___ a child? For running after a toddler (学走步的小孩), for understanding a ___44___ teenager, for tolerating (忍受;容忍) a college student who knows ___45___ ? For waiting for the day when a daughter ___46___ how wise her mother really is?
　　How does a ___47___ woman thank a mother for ___48___ to be a mother? For being ready ___49___ advice (when asked) or remaining ___50____ when it is most appreciated? For not saying, “I told you so,” when she could have uttered these words ___51___? For being ___52___ herself-loving, thoughtful, patient, and forgiving?
I don’t know how, dear God, except to ask you to bless her as richly as she ___53___ and to help me live up to the example she has ___54___. I pray that I will look as good in the eyes of my children as my mother ___55___ in mine.

A．dozen times	B．a dozen of times
C．dozens of times	D．dozen of time

B．essentially