填空题The icebergs are dangerous because they are hidden ______ and can turn over unexpectedly.
单项选择题A.Very cool weather.B.Very warm weather.C.Raining weather.D.Fair weather.
单项选择题A.It’s less expensive.B.It’s more comfortable.C.It’s faster.D.It’s more direct.
单项选择题A.In the Paciffic Ocean.B.Close to Europe.C.Nobody knows.D.In the Atlantic Ocean.
单项选择题A.1B.2C.3D.4