People are confused in their attempts to control malaria in Europe in the early 1900s, because scientists ______.

A．identified only one mosquito species instead of six species

B．thought only three mosquito species transmitted disease

C．thought there was only one mosquito species

D．did not know what species was being studied

A.Confused ; asked B.Confused ; ask C.onfusing ; asked D.Confusing ; as

[试题]Markoftenattemptstoescape_____wheneverhebreakstrafficregulations.(A)havingbeenfined(C)tohavebeenfined(B)tobefined(D)beingfined

Her __ attempts to interview the president turned out to be fruitless.A. instant

Mike often attempts to escape whenever he breaks traffic regulations.A. having b

All their attempts to________ the child from the burning building were in vain.（

[单选题]When the teacher attempts to elicit more information from the students by s

[问答题]Almost all Americans want to be democratic, but many Americans are confused

[单选题]When the teacher attempts to elicit more information from the students bysa

[单选题]After passing all three levels of the CFA exams on her first attempts and b

[单选题]Ira teacher attempts to implement the bottom-up model to teach listening, h