Reading a Grade 5 Fact Text
RI.5.10
Read the text, then answer the questions.
Why the Thames Froze
Between 1309 and 1814 the Thames froze hard enough to walk on at least twenty-four times. Since 1814 it has not once. The usual explanation is that the climate has warmed. That is part of it, and not most of it. Old London Bridge had nineteen arches on wide stone piers. The piers took up so much of the channel that the bridge acted as a weir, slowing the water upstream almost to a standstill. Still water freezes; moving water does not. The river was also shallower and wider then, spreading over land that has since been embanked. Shallow water loses heat faster. Old London Bridge was demolished in 1831. The embankments were built between 1862 and 1874. The river that flows through London now is narrower, deeper and faster than the one that froze — and it would not freeze in a colder winter than any of those.
- 1. The text gives three reasons for the freezes. Identify them and say which is treated as least important.
- 2. When was Old London Bridge demolished?
- 3. Determine two main ideas of this text and explain how details support each.
- 4. What is the author's purpose, and how do you know?
Can You Do Two Things at Once?
People say they multitask. Mostly they do not. The brain can run two tasks together only if at least one is automatic. Walking and talking works because walking is automatic for an adult. Reading and listening to speech does not, because both need the same language system. What feels like multitasking is usually rapid switching. Each switch costs time — a fraction of a second to disengage and re-engage — and the costs add up. In experiments, people doing two tasks alternately take substantially longer in total than doing them one after the other, and make more errors. They also do not notice. Switching feels efficient because you are busy the whole time. The practical conclusion is unpopular but consistent: for anything demanding, doing one thing at a time is faster.
- 1. What is the author's purpose, and how do you know?
- 2. The text makes two claims about multitasking. Identify the evidence for each.
- 3. When can the brain genuinely run two tasks together?
- 4. Why does reading while listening to speech not work?
LessonPrint · RI.5.10 · Set 7 · free to copy for classroom use