C．leaners and farmers do ______scientists do.

A． the same work as

B． less important work than

C． more work than

D． as important work as

[单选题]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]D．o scientists know how many cryptic species exist?A．Not yet.B．Yes, they do.C．They will know the answer in another one or two years.D．They will never know the answer.

[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]Excerpt 1　　Do you remember all those years when scientists argued that smok

[单选题]Excerpt 1　　Do you remember all those years when scientists argued that smok