[单项选择]

Water, water everywhere. It lasted almost two months, but in August it ended. It left 45 people dead and $10 billion worth of damage in nine states of USA. It was quite a big Mississippi flood ever recorded.
In St. Louis, Missouri, 9,000 people were forced to leave their homes while the city was in danger. St. Louis is just downriver from the points where the Missouri and Illinois Rivers flow into the Mississippi. All three rivers were flooding. But the city escaped the worst when levees (堤) broke upriver. A levee is built of fiver sand and clay (粘土).
Eleven miles of flood walls were built in the late 1960’s. The walls are 18 inches thick and 5 to 22 feet high. They were designed to protect against a 52-foot flood. In St. Louis, water almost reached the top of flood wails. It measured 49.4 feet.

The highest flood referred to in the passage was about （　）.
A. 18 feet high
B. 5～22 feet high
C. nearly 50 feet high
D. 52 feet high

最新试题

• ●    [多选题]标准作业的三个基本要素是：
• ●    [判断题]动车所安全联锁控制系统主要由PLC网络控制子系统、计算机动画显示子系统、门禁控制子系统和视
• ●    MENⅠ型指（）
• ●    综合各种不同的方法，一般来说战略评价的标准有（）
• ●    [单选题]变压器容量在（ ）kVA及以上的大工业用户实行两部制电价。
• ●    [单选题]本身不具有生物活性, 需经过体内代谢活化的维生素就是 ( )