cExams.net
Test # 23


1.
Choose an idiom to replace the expression in the brackets:
I (heard about) my promotion last night.

Login/Register to access massive collection of FREE questions and answers.
Login/Register

Idioms Quiz
Quiz Index
590 questions in 59 tests. Each test contains 10 questions.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

  • 101 Things to Do Before You Die
  • Motorcycle Racing?
  • Strangest Prehistoric Creatures To Rule The Earth
  • English Grammar
  • World Architecture
  • Tooth Decay

  • Simple Science

    Methods of Purification

    Water:
    Water is improved by any of the following methods: -

    (a) Boiling. The heat of boiling destroys animal and vegetable germs. Hence water that has been boiled a few minutes is safe to use. This is the most practical method of purification in the home, and is very efficient. The boiled water should be kept in clean, corked bottles; otherwise foreign substances from the atmosphere reŽnter the water, and the advantage gained from boiling is lost.

    (b) Distillation. By this method pure water is obtained, but this method of purification cannot be used conveniently in the home.

    (c) Filtration. In filtration, the water is forced through porcelain or other porous substances which allow the passage of water, but which hold back the minute foreign particles suspended in the water. The filters used in ordinary dwellings are of stone, asbestos, or charcoal. They are often valueless, because they soon become choked and cannot be properly cleaned.

    The filtration plants owned and operated by large cities are usually safe; there is careful supervision of the filters, and frequent and effective cleanings are made. In many cities the filtration system is so good that private care of the water supply is unnecessary.


    Chourishi Systems