For their offices, all the staff were given ________.
A. a budget to spend on furniture
B. the same kind of furniture
C. a limited choice of furniture
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Sally thinks that people are usually unhappy at work because _____.
A. their salaries are too low
B. there is too much work to complete
C. there is too much management control
21、下列化合物不属于有机物的是（）。
A. CO
B. CH3OH
CH3COOH
D. CH4
44、下列叙述正确的是（）
A. 通式为CnH2n+2的烃一定为烷烃
B. 通式为CnH2n的烃一定为烯烃
C. 分子式为C4H6的烃一定为炔烃
D. 相对分子质量为128的烃不一定是烷烃
下列式子表示甲基的是（）
A. —CH（CH3）2
B. —CH2CH2CH3
C. —CH3 —CH2
D. — CH3
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