The experiment has_________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

A． found out

B． pointed out

C． ruled out

D． carried out

[单选题]8． Lucy has_________ volleyballs．A． twenty -fiveB． twenty fiveC． twenty fifthD． five-twenty

[问答题]It has not been decided yet whether they will take part in our experiment.

[单选题]The experiment ______ the discovery of a cure for cancer.A． happened toB． led upC． resulted inD． set up

[单选题]B．y mentioning the experiment in the second paragraph，the author implies that______.（ ）[A]our definition of what’s normal varies with gender[B]our focus of attention variesl with gender and age[C]our definition of what’s average changes over time[D]o

[单选题]The experiment showed that the smaller fish .A． fought over a feast B. went on diet willinglyC． preferred some extra food D. challenged the boss fish

[单选题]The experiment was ______ easier titan we had expected.A． moreB． much moreC． muchD． more much

[单选题]The experiment ended in failure ______the lack of money.A． asB． byC． forD． with

[单选题]The original experiment cannot be exactly duplicated.A . reproducedB . inventedC . designedD . reported

[单选题]The experiment is carried cut to prove ______.A． water pushes on your body when you swim underwater.B． the earth is surrounded by a layer of air called the atmosphere.C． the pressure of air around us has a powerful force.D． the air pressure is not eq

[单选题]In the experiment, the burning inside the bottle can___.A． equalize the air pressure inside and outsideB． make a seal in the neck of the bottleC． finish up the oxygen inside the bottleD． produce more oxygen inside the bottle