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问题 选择题

若∠1与∠2互补，∠2与∠3互补，∠1=50°，则∠3等于（　　）

A．50°

B．130°

C．40°

D．140°

答案

∵∠1+∠2=180°，∠2+∠3=180°，

∴∠3=∠1=50°．

故选A．

听力题

根据句意和音标提示以适当形式填写单词。答案填写到答题纸指定位置。

小题1:He has done a lot of _____________/ri'sə: tʃ/ on that subject.

小题2:It would be exciting to ___________/dis'kʌvə/ more about the town’s history.

小题3:Gold and silver are both ___________/ 'metl/.

小题4:It’s important for us to have a ___________/.saiən'tifik/ method in studying English.

小题5:This dress is too small for me. Could you please give me a bigger _________/saiz/?

小题6:Children should be taught to __________/ʃeə/their toys with others.
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单项选择题

更换清扫器的标准是清扫器胶皮上缘与夹铁的距离低（）时要及时换。

A.30—40mm

B.40－50mm

C.50－60mm
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