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举一反三
【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...
A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.
【单选题】风蚀强度分级按植被覆盖度（%）、年风蚀厚度（mm）、侵蚀模数[t／（km2.a）]三项指标划分，以下三项指标属中度风蚀强度的是（）t／（km2.a）。
A.
70～50，2～10，200～2500
B.
50～30，10～25，2500～5000
C.
10～30，25～50，5000～8000
D.
<10，50～100，8000～15000