4.If we say "Derek and his twin brother Dick havestrikingdifferences in their personalities", it means the personality differences of Derek and Dick are __________.
A. very easy to be noticed
B. very hard to be noticed
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5.The expression "cultivatea habit" means we __________.
A. try hard to develop this habit
B. try hard to get rid of this habit
6.The wordimplyrefers to __________.
A. express or state directly
B. express or state indirectly
水电工程常被称其为()?
A. 施工工程
B. 隐蔽工程
C. 水路工程
D. 电路工程
在国内给水管常用()?
A. ppr
B. pvc
C. 铜管
D. 铝塑复合管