问题
选择题
下列物质中属于氧化物的是
A．O2
B．HCl
C．MgO
D．H2SO4
答案
答案：C
题目分析：O2 是单质；HCl是化合物，不含氧元素；MgO是氧化物；H2SO4 是含氧化合物，但不是氧化物。选C。
点评：氧化物是由两种元素组成，其中一种是氧元素的化合物。
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下列物质中属于氧化物的是
A．O2
B．HCl
C．MgO
D．H2SO4
答案：C
题目分析：O2 是单质；HCl是化合物，不含氧元素；MgO是氧化物；H2SO4 是含氧化合物，但不是氧化物。选C。
点评：氧化物是由两种元素组成，其中一种是氧元素的化合物。
小题1:We can _______ on Friday night. A. see a movie B. give books to the library C .come to the Art Festival 小题2:If we want to watch different programs, we may go to the school hall ______. A. on Friday B. on Saturday C. tomorrow afternoon 小题3:There is a basketball game between ______and ______at 4:30 p.m. tomorrow. A. our school; No. 1 High school B. No. 1 High school; No. 3 High school C. our school; No. 3 High school 小题4:We can give old books to the library ________. A. at nine a.m. on Sunday B. at six p.m. on Monday C. at 11:00 a.m. on Friday 小题5:Which of the following is NOT true? A. The basketball game is between our school and No. 2 High School. B. We can go to the movies at 7:30 p. m. on Friday. C. Our friends can come to the Art Festival with us. |