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问题 选择题

I didn't do my homework well, so I always felt________and I would make an effort to go on with it,

instead of being  discouraged.  [ ]

A. unconscious                    

B. anxious  

C. uncomfortable                  

D. unfit

答案

答案：B

选择题

在常温下，由水电离产生的H+浓度为1×10-13mol·L-1的溶液中，一定能大量共存的离子组是[ ]

① K+、Cl-、NO3-、S2-

② K+、Fe2+、I-、SO42-

③ Na+、Cl-、NO3-、SO42-

④Na+、Ca2+、Cl-、HCO3-

⑤ K+、Ba2+、Cl-、NO3-

A．①③

B．③⑤

C．③④

D．②⑤

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选择题

There is a brook ____ red flowers and green grass ___ both sides. [ ]

A. of; with

B. with; on

C. of; at

D. with; in

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