动脉粥样硬化的预防应从何时开始()
A.婴儿期
B.童年期
C.青年期
D.中年期
E.老年期
参考答案:B
I have no idea ______ measures the government will take to stop the air from being further polluted.
A.which
B.what
C.that
D.whose
试述红外线标准化人员要求的内容?