单词拼写（共10小题，计l0分）                          

小题1:What a p_____ ! He missed the last bus. He had to walk home.

小题2:Smiling costs n________, but gives so much.                    

小题3:I like Thursday , the f________ day of a week best, because I can play golf that afternoon.

小题4:Which is f______, traveling by train or by plane?

小题5:Jeff is a good l________, he always pays attention to you when you are talking. 

小题6:I like dogs because they are always f__________.

小题7:English is w______ used around the world for computers.

小题8:In fact, I don’t like playing computer. I just think it’s a good way to k_____ time.                                               

小题9:–W_____ are these bags?     –They belong to Emma.

小题10:I really don’t know w_________ I should take a gift or not when I am first invited to a dinner in the U.S.                        

维生素B₁₂缺乏导致的神经系统变性疾病，病变主要累及脊髓后索、侧索及周围神经。临床表现双下肢深感觉缺失，感觉性共济失调，痉挛性截瘫及周围性神经病变等。描述的疾病是（）.

A.急性脊髓炎

B.急性上升性脊髓炎

C.慢性脊髓压迫症

D.脊髓空洞症

E.脊髓亚急性联合变性