【单选题】According to the experts, the reversal of the Earth's magnetic field would ______.
A.
destroy almost all the creatures on the Earth
B.
cause some species extinctions on the Earth
C.
not be as disastrous as the previous one
D.
cause no big trouble for man and animals
【简答题】A.A rapid rise in population. B.A shortage of fuel. C.Destroy of the wilderness. D.Destroy of the natural resources.
【单选题】With the bridge______, there was nothing for the river but to swim.
【单选题】By comparison, the author considers that ______.
A.
a more advanced civilization will destroy us if they visit us at present
B.
the original inhabitants of America were better off because of Columbus' visit
C.
being visited by a more advanced civilization will do us good
D.
we wouldn' t be better off even though we were visited by the beings from outer space at present
【简答题】Scientists in California and Virginia will try to decode genetic makeup of two plant-destroying microbes, including 【M1】______ one blaming for killing tens of thousands of oak trees along the 【M2】____...