¡¡¡¡The most important use of drifting(ƯÁ÷)bottles is to find ocean currents£®When the position and direction of currents are known, ships can use the forward movement of a current or stay away from currents that would carry them off their course£®Benjamin Franklin was one of the first to use bottles in the study of currents£®He wondered why British mall ships needed a week or two longer than U£®S£®ships needed in order to cross the Atlantic Ocean£®Franklin thought the Gulf Stream(Ä«Î÷¸çÍåÁ÷)might explain this difference£®
¡¡¡¡Franklin talked with captains of U£®S£®ships£®He found that they knew each turn of the Gulf Stream£®They used the current in every possible way£®From his talks with the captains£®Franklin made his first map of the Gulf Stream£®Then he checked his map by using sealed(ÃÜ·âµÄ)bottles£®The map that he finally made is still used, with only a few changes, today£®
(1)
Why are drifting bottles used?
[¡¡¡¡]
A£®
To determine the position of a ship£®
B£®
To find the direction of a current£®
C£®
To predict the direction of a ship£®
D£®
To carry message across the ocean£®
(2)
What led Franklin to talk with U£®S£®captains?
[¡¡¡¡]
A£®
U£®S£®ships were longer than British ones£®
B£®
British ships could sail the Atlantic faster than U£®S£®ones£®
C£®
U£®S£®ships could sail the Atlantic faster than U£®S£®ones£®
D£®
U£®S captains knew more about maps£®
(3)
What did Franklin make after his talks with U£®S£®captains?
[¡¡¡¡]
A£®
A map of the Gulf Stream£®
B£®
A map of the Atlantic Ocean£®
C£®
A map of ocean currents£®
D£®
A map of his first voyage£®
(4)
What did Franklin do in order to make an exact map?
[¡¡¡¡]
A£®
He compared his own map with other maps£®
B£®
He talked with many U£®S£®captains£®
C£®
He used drifting bottles to check his map£®
D£®
Both B and C£®
(5)
The underlined word current in the first paragraph means ________£®