WHY AREN’T SWEETS GOOD FOR OUR TEETH

85. Why aren’t sweets good for our teeth?

a. they have a lot of sugar b. they cause decay c. they are expensive d. they are bad

Question 86-90In 1920, after some 39 years of problems with diseases, high cost and politics,The Panama Canal was officially opened, finally linking the Atlantic and PacificOceans by allowing ships to pass through the fifty-mile canal zone instead of travellingsome seven thousands miles around Cape Horn. It takes a ship approximately eighthours to complete the trip through the canal and costs an average of fifteen thousanddollars, one tenth of what it would cost an average ship to round the Horn. More thanfifteen thousand ships pass through its locks each year.