生命起源的第一步是[ ] A．在一定条件下，原始地球上的原始_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

生命起源的第一步是[ ]

A．在一定条件下，原始地球上的原始大气中各种成分是能够转变为有机小分子的

B．伴随原始地球上自然条件的演变，地球上的有机大分子在原始海洋中逐渐积累，通过长期的相互作用，最后演变成具有能够生长、生殖、遗传的原始生命

C．原始生命进一步形成单细胞生物，地球上的生物从此生机勃勃，不断进化发展

D．由有机小分子合成蛋白质、核酸等有机大分子

答案

答案：A

完形填空

I believe in miracles because I’ve seen so many of them.One day,a patient was referred to me who was one hundred and two years old.“There’s a 36 in my upper jaw,”she said.“I told my own dentist it’s nothing,but he 37 I come to see you.”
Her eighty-year-old son accompanied her.He would 38 to add something,but she stopped him.She wanted to tell everything hereslf.I found a large cancer that spread over much of the 39 of her mouth.A careful examination later 40 that it was a particularly bad sort of cancer.
During her next appointment,I explained to her the 41 of the problem.She clasped my hand in hers and said,“I know you’re worried about me,but I’m just 42 .”
I thought otherwise.After considerable 43 on my part,and kindness on her part because she wanted to 44 me,she agreed to have me refer her to a cancer surgeon.She saw him,but as I expected, 45 treatment.
About six months later she retarned to my office,still energetic and 46 .
“How are you?”I asked.
“I’m just fine,honey,”she responded 47 high spirits.“When can I get started on fixing my dentures(假牙)?”
Surprised to see her at all,I answered 48 ,“Let me take a look in your mouth and we’ll see about it.”
I couldn’t believe my eyes.The cancer that had 49 nearly the entire roof of her mouth was gone—only one small area of redness 50 .
I had read of such things happening,but had 51 seen them with my own eyes.That was my first miracle.Since then I’ve seen many others,because they keep getting 52 to see.In fact,miracles are daily events for me now.And people are a miracle, 53 through them we have a chance to know ourselves and to 54 the miracles of one another.
Since my first miracle,I’ve come to understand that the time and place for a miracle is 55 we choose to find it.

A．possibility

B．seriousness

小题11:A.healthy B.elegant C.optimistic C.humorous

D．confidently

单项选择题

下列各药分布容积最低的是（）。

A.BDP

B.BUD

C.FP

D.MF