在近紫外区有吸收的有机化合物为()。
A、CH3-CH2-CH2-CH3
B、CH3-CH2-CH2-OH
C、CH2=CH2
D、CH3-CH=CH-CH=CH-CH3
参考答案:D
我不在的时候皮特表现规矩吗?
—Where is Jack?
— In the sitting room. He _______ TV with his brother.
A.watch
B.watched
C.is watching
D.was watching