有关原醛症患者神经肌肉功能障碍，下列正确的是（）

A.在低钾严重时，手足搐搦严重，补钾后，手足搐搦消失

B.可表现为肌无力及周期性瘫痪，血钾愈低，肌肉受累愈重

C.以上都对

D.肢端麻木，手足搐搦

E.在低钾严重时，由于神经肌肉应激性降低，手足搐搦可减轻或不出现，而在补钾后，手足搐搦变得明显

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．More and more people are used to the Internet.

B．Cell pones are Becoming an important part of our life.

C．Postcards are in the danger of extinction.

D．Communications between people are becoming easier.