21．Beijing is the most beautiful city in China and Hong Kong is ________ safest and second most beautiful，according to ________ recent study.
A．a；the B．the；/ C．a；a D．the；a
22．—What ________ do you focus on when choosing a mobile phone for personal use?
—Its functions and standby time.
A．marks B．signs C．symbols D．features
23. he is poor, he’s ready to help his friends who are in trouble, which makes him very popular.
A. Although B. However C. As D. Whether
24．Ireland lies ________ the northwest of Europe and ________ the west coast of Great Britain.A．in；off B．to；on C．in；across D．to；off
