The scientists are trying to find oust if masks may or may not______.A. overuse face masks

The scientists told people to use Internet less．

A.Right．

B.Wrong．

C.Doesn’t Say．

It is not until recently ______ there are many different kinds of hearing defects.

A．have the scientists discovered

B．the scientists have discovered

C．that the scientists have discovered

D．that will the scientist have discovered

According t(the scientists，the ape’s choice in the next experiments was_________． A) simply instinctive B)like rational thinking C)as intelligent as human D)beyond expectation

Which of the following is NOT mentioned about scientists in earlier times？

A．They invented false theories to explain things they didn't understand.

B．They paid little attention to the problems they didn't understand.

C．They did not believe in results from scientific observation.

D．They falsely claimed to know all about nature.

Scientists think American mink has more useful fur.

A．Right.

B．Wrong

C．Doesn't Say.

All of the following statements are true of climate scientists EXCEPT that

A．they are all clued up about climate.

B．they don't know much about climate.

C．they are probing into the field of climate.

D．they are uncertain of climatic phenomena.

The third paragraph implies that______.

A．genetic scientists don't go far enough into their research on safety concerns of genetically-modified food

B．at present biotechnology does not grow healthily

C．molecular geneticists cooperate with biotech companies

D．the government should be fully responsible for people's health