Researchers at the University of Illinois determined that the ______ of a father can help
A. involvement
B. communication
C. interaction
D. association
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Which of the following is right according to the passage？
A. Some coast lines do not have two tides each day.
B. Tides are not affected by the shape of coast line.
C. The sun has as much effect on tides as does the moon.
D. Tides usually rise to the same land day after day.
The tramp was locked in the store______.
A. through an error of his own
B. due to the mistake of Christmas shoppers
C. by accident
D. through a trick of his
根据水利水电工程施工中常用土的工程分类，I类土的自然湿密度应为()。
A. 1000～1100kg/m3
B. 1350～1650kg/m3
C. 1650～1750kg/m3
D. 1750～1850kg/m3
Advertising can persuade the consumer to buy worthless product by______.
A. stressing their high quality
B. convincing him of their low price
C. maintaining a balance between quality and price
D. appealing to his buying motives
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