Experts think that __________recently discovered painting may be ________ Picasso.
A．the ;不填 B．the; a C．a ;the D．a ; 不填
It is not clear ____the effects of global warming will be.
A．how B．which C．that D．what
All the scientific evidence ______ that increasing use of carbon dioxide ______ the rise of the earth’s temperature.
A．show; result in B．shows; result from
C．shows; results in D．shows; results from
Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.
A．should B．would C．will D．must
During the Middle Ages, a conventional artist was not interested in showing nature and people _____they really were.
A. who B what C. like D. as
________volcanoes now for many years, I am still as enthusiastic about my job as the first day I first______.
A．Studied, started B．Have studied, started
C．Having studied, started D．Having studied, starting
