What will scientists do to make sure the poison works this time?

A． They will try some of it themselves.

B． They will use a special kind of poison.

C． They will drain the lake first.

D． They will only put the poison in the wells.

[单选题]What did the scientists do to find out if the e-nose worked?A． They presented it with all common crops..B． They fixed 13 sensors inside the device.C． They collected different damaged leaves.D． They made tests on damaged and healthy leaves.

[单选题]Be sure to make the engine turn by （） before starting and after stopping .A . steering gearB . turning gearC . steering wheelD . turning cycle

[试题]______(make)sure that holidays and pay are not the first things you ask about.

[试题]______74_________ Make sure there is a table

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]27． Scientists ____to make the deserts into good land again．A． carry water'B．grow foodC． do nothingD． study a lot