中国的网络安全防护还比较薄弱，中国在社会与军事领域均是网络攻击的受害者。（）

Tina ______ England with her parents three years ago. [ ]

A. visits

B. visited

C. will visit

D. has visited

The directors of ABC Limited, Alex and Mark are both qualifi ed accountants. Mark has taken on the role of preparing the fi nancial statements of the company and ensuring that these are fi led on time with the competent authorities. Alex on the other hand, is an auditor by profession and is preparing to audit the fi nancial statements for ABC Limited.Required:

(b) Advise whether Alex may audit the fi nancial statements of ABC Limited. (3 marks)

基金托管人负责基金的投资操作，基金财产的保管由独立于基金托管人的基金管理人负责。这种相互制约、相互监督的制衡机制对投资者的利益提供了重要保护。（　　）

抗菌药物应每隔多长时间服用一次？（）.

A.1小时

B.3小时

C.5小时

D.6小时

熔剂块的破碎，是一个（）破碎。