如图1所示,在高楼前D点测得楼顶的仰角为30°,向高楼前进60米到C点,又测得仰角为45°,则该高楼的高度大约为()。
A.82米
B.123米
C.163米
D.52米
E.70米
According to the passage, the parity system is used to ______.
A.encourage farmers to produce more grains in the future
B.lower the cost of producing agricultural product
C.determine the prices below which grains will not be sold
D.ensure that the farmers' interest is properly protected
What does the word "disruptive" (Paragraph 3) most probably mean?
A.Naughty.
B.Rude.
C.Bad-mannered.
D.Careless.
The police searched the building __ but failed to find out where the bomb was.
A.throughout
B.fully
C.altogether
D.thoroughly
By "common resources" (Paragraph 2), the author means that ______.
A.the resources possessed by the United States should be shared by other countries
B.Americans have the right to consume resources both from their home country and from abroad
C.it is difficult to distinguish the resources possessed by America from those possessed by other countries
D.all the resources in the world should be shared by all the countries
A.that
B.what
C.where
D.why