问题 选择题

小明同学对下列四个实验都设计了方案,其中方案不合理的是

选项ABCD
实验要求区分羊毛线和

棉线

区分食盐水和

稀盐酸

区分硝酸铵粉末

和氢氧化钠粉末

区分聚乙烯和

聚氯乙烯

方案灼烧闻气味滴加酚酞试液加水灼烧闻气味

答案

答案:B

本题考查的是物质的鉴别、推断,溶解时的吸热或放热现象,酸、碱、盐的鉴别,塑料及其应用,棉纤维、羊毛纤维和合成纤维的鉴别。

A、羊毛是蛋白质,燃烧有烧焦羽毛的气味,棉线属于植物纤维,灼烧时迅速,灰烬易碎,故可鉴别;

B、食盐水呈中性,稀盐酸呈酸性,都不能使酚酞试液变色,故不能鉴别;

C、硝酸铵溶于水吸热,温度降低,氢氧化钠溶于水放热,温度升高,故可鉴别;

D、聚氯乙烯灼烧有臭味,而聚乙烯没有,故燃烧闻气味可以鉴别。故选B

填空题
阅读理解

When Frida Kahlo’s paintings were on show in London, a poet described her paintings as “ a ribbon (丝带)around a bomb”. Such comments seem to suggest Kahlo had a big influence on the art world of her time. Sadly, she is actually a much bigger name today than she was during her time.

Born in 1907 in a village near Mexico City , Kahlo suffered from polio(小儿麻痹症)at the age of seven. Her  spine(脊柱)become bent as she grew older. Then, in 1925, her back was broken in several places in a school-bus accident. Throughout the rest of her life, the artist had many operations, but noting was able to cure the terrible pain in her back. However, the accident had an unexpected side effect. While lying in her bed recovering, Kahlo taught herself to paint.

In 1929, she got married to Diego Rivera, another famous Mexican artist. Rivera’s strong influences on Kahlo’s style can be seen in her early works, but her later works from the 1940s, known today as her best works, show less influence from her husband.

Unfortunately, her works did not attract much attention in the 1930s and1940s, even in her home country. Her first one-woman show in Mexico was not held until 1953.For more than a decade after her death in 1954, Kahlo’s works remained largely unnoticed by the world, but in the 1970s her works began to gain international fame at last.

小题1:What does the phrase “a much bigger name” in paragraph 1 most nearly mean?

A.a far better artist

B.a for more gifted artist

C.a much stronger person

D.a much more famous person小题2:The terrible pain Kahlo suffered was caused by         .

A.polio

B.her bent spine

C.back injuries

D.the operations she had小题3:Kahlo’s style had become increasingly independent since the           .

A.1930s

B.1940s

C.1950s

D.1970s小题4:What is author’s attitude toward Kahlo?

A.Devotion

B.Sympathy

C.Worry

D.Encouragement