2010年诺贝尔物理学奖授予英国科学家海姆和诺活肖洛夫，以表彰他们在石墨烯材料方
题型：选择题
问题：
2010年诺贝尔物理学奖授予英国科学家海姆和诺活肖洛夫，以表彰他们在石墨烯材料方面的卓越研究，石墨烯是从石墨材料中剥离制得的，与金刚石、石墨一样，都只由碳元素组成．如图是金刚石、石墨、C60和石墨烯的微观结构示意图．下列说法错误的是（ ）
A．它们都是单质
B．一个C60分子由60个碳原子构成
C．它们的结构中碳原子的排列方式都相同
D．它们在氧气中充分燃烧时都生成二氧化碳
题型：选择题
阅读理解。
The price of rice changes during the year.
It is useful for rice farmers to know how the price changes, then they can sell their rice when the price is
high.
Last year, the price of rice was very low in November. This was a bad time for farmers to sell their rice.
November, December, and January were all bad months.
The best month for farmers to sell rice last year was April. July and August were also good times to sell rice.
Between August and November, the price of rice went down every month. During other parts of the year,
the price went up and down.
It was hard for farmers to guess how the price would change from month to month.
1. The underlined word "changes" in Paragraph 2 means _____.
A. becomes smaller
B. gets more
C. goes up and down
D. stays the same
2. The price of rice was the lowest in _____ last year.
A. January
B. April
C. July
D. November
3. In which months did the price of rice stay the same last year?
A. April and May
B. July and August
C. February and December
D. March and November
4. When could farmers probably guess the change in price during the year?
A. Spring
B. Summer
C. Fall
D. Winter
5. Which is the best title (题目) of the reading?
A. Seasons
B. Changing in Price of Rice
C. Months
D. Buying and Selling