问题 选择题

下列叙述不正确的是(    )

A.元素的种类由质子数决定

B.由同种分子构成的物质不一定是单质

C.氢原子是保持氢气化学性质的最小粒子

D.化合物的分子中一定含有两种或两种以上的原子

答案

C.

题目分析:A、根据不同种元素之间的本质区别是质子数不同,所以元素的种类由质子数决定;故A说法正确;B、根据金刚石与石墨,由同种分子构成的物质,不一定是单质,故B说法正确;C、根据分子中保持物质化学性质的最小粒子,原子是化学变化中的最小粒子,故C说法错误;D、根据化合物由两种或两种以上的元素组成的纯净物,所以化合物的分子中一定含有两种或两种以上的原子;故D说法正确

阅读理解

In a famous story, a young boy called Ali Baba says “Open Sesame” and a door to treasures is opened before him. Ma Yun drew inspiration from this and founded Alibaba.com.

Over 14 years, Alibaba.com has become China’s largest e-commerce (电子商务) website. E-commerce is the a   小题1: of buying and selling goods and services and doing other business activities using a computer and the Internet. However, the founder chose to leave and to discover new areas of business. On May 28, Ma became chairman of Cainiao Network Technology Co., Ltd.The company will set up China Smart Logistics (物流) Network. Its goal is to deliver packages (运送包裹) to people anywhere in the country w  小题2:  24 hours.

The 48-year-old businessman, who is short and thin and often wears oversized suits, always had he courage to dream big and try new things.

Ma got the idea or starting a business career in 1995. He was then working for a US trading company as a translator, when he was introduced to the Internet. He s  小题3: the word "beer" and saw that no data came up about Chinese products(产品).

Ma had an idea: why not build a large Internet market to connect(连接)consumers and companies from all over the world and do business o 小题4:   ?

That is how Alibaba began. His company grew quickly. But that doesn't mean e 小题5:    went well. Alibaba had a difficult time in 2000, when many Internet companies failed. Ma was successful because he m   小题6:   to attract investment(投资)in his company.

But there is a deeper r  小题7:   for Ma's success: his attitude. "You deserve (值得) to live your dream," said. "Everyone thought I was daydreaming when I started. But the most important thing is that we believed in our dream from day one, to today and tomorrow Of course we made many mistakes, but we never gave up hope."

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