第一节:多项选择 (共10小题;每小题1分,满分10分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. From facts,
scientists have_______ that more energy is being absorbed from the sun, throwing
the earth’s energy “out of balance”.
A. confirmed B.
concluded C.
concentrated D.
centered