从科学史看，理论再伟大，也只有在特定的范围内才是正确的。标准模型虽然即将被证实，但其

托收承付是一种可以用于同城结算的方式。( )

根据下列短文内容，在短文中的空格处填上一个恰当的词，使短文完整、通顺。

    Do you have a computer? Do you have your blog(博客)?I have one.I   1   it very much.I use it to write compositions, to read interesting books and sports news, to    2    to music, to search for something useful,to deal with e-mails    3   to chat with my net friends.It's really my good helper.

    A year ago,l made a nice blog on the computer.I put   4   photos and interesting stories on it.So far I've got lots of e-mails and information   5   all over China.I am proud of this.

    Thanks  to  my blog, I've learnt a lot out of textbooks.And it has been my   6    friend. Do you know?I never play   7   games because I think it is a waste of time.   8   a student,time is useful for us and we must do well in our lessons.

男性，48岁，慢性发作性、节律性上腹痛5年，伴有反酸，近期病情复发。

此患者近1个月上腹痛失去节律且较剧烈，并放射至背部，可能的情况是（）。

A.胃前壁溃疡

B.胃后壁溃疡

C.十二指肠球前壁溃疡

D.十二指肠球后壁溃疡穿孔

E.十二指肠球后溃疡

下列说法正确的是[ ]

A.0℃的冰比0℃的水冷一些

B.灯丝用钨丝而不用铁丝是因为钨的熔点高

C.物质在熔化过程中，温度保持不变

D.物质吸热后温度一定升高