Which of the safety developments is NOT mentioned in the passage？
A. Radars that can help drivers to see obstacles in fog．
B. Devices that can help drivers to see through big vehicles．
C. Improvements in seat helts，pedal controls and tyres．
D. Windscreens that can help drivers to improve their vision．
She likes to visit exotic islands．
A. disrant
B. interesting
C. remote
D. backwards
The salt concentration in the liquid water of Lake Vida__________.
在Windows中，若系统长时间不响应用户的要求，为了结束该任务，应使用的组合键是（）。
A. Shift+Esc+Tab
B. Ctrl+AIt+Del
C. Alt+Shift+Enter
D. Ctrl+Shift+Enter
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