下图中，横轴表示细胞周期，纵轴表示一个细胞核中DNA含量或染色体数目的变化情况。请分析图示，表示有丝分裂中DNA含量变化、染色体数目变化和减数分裂过程中DNA含量变化、染色体数目变化的曲线依次分别是（  ）

    Job interviews can be very different from country. An interviewer's “body language” and questions, and the form of an interview are not the same around the world.

    If you're at a job interview in Japan, don't look directly into the eyes of the interviewer. It is considered impolite. But if you're at an interview in the US, you should make eye contact(交流) with the interviewer. If you don't, the interviewer may think you are not sure about your ability.

    In the US and some other countries, interviewers aren't supposed to ask questions about family and personal information. In most countries, however, personal questions are very common during job interviews.

    In Germany, your interview might begin with a very short conversation followed by a formal(正式的) interview. In Mexico and many other countries, the whole interview might not be formal.

设$\omega =-\frac{1}{2}+\frac{\sqrt{3}}{2}i$,A={x|x=ω^k+ω^－k,k∈Z},则集合A中的元素有(  )

阅读下面这段文字，根据拼音写出相应的汉字。
生命就像一江春水，有时会遇到悬yá       峭壁的阻拦，这时请你不要páihuái      不前，勇敢地穿越它，你会收获柳暗花明的喜悦；有时会遇到疾风暴雨的击打，这时你也不必zhānɡhuánɡ-shīcuò          ，经过风雨的洗礼，你会积聚更顽强的力量。

地球仪上的纬线（    ）