单项选择题
A.for the highest price offered B.only at fixed prices C.at a price less than their true value D.very cheaply
A.it protects him against the harmful rays from space B.it provides sufficient light for plant growth C.it supplies the heat necessary for human survival D.it screens off the falling meteors
A.feel they are mistreated because of limited knowledge of English B.are afraid that their academic successes bear a strong Asian character C.still worry about unfair treatment in society D.generally feel it a shame to have to depend on their parents