(2013·浙江溫州二模)Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.

A．what B．that

C．which D．whether

(2013·銀川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.

A．whether B．how

C．where D．when

(2013·江西兩所名校二模)The progress of the work will depend on what the weather conditions are and ________ modern the equipment is.

A．how B．whether

C．what D．which

(2013·四川省重點中學二模)________ Sandy's damage is unlikely to last long, it would apparently hurt the total economic output of the fourth quarter.

A．Since B．Before

C．Unless D．Although

(2013·陜西五校二模)—How do you like the book?

—It's quite different from ________ I read last month.

A．that B．the one what

C．the one D．which

(2013·大連二模)—When choosing furniture, you only focus on function while I think more about the design.

—That's ________ we differ.

A．how B．what

C．which D．where

(2013·陜西寶雞二檢)The course about Chinese food attracts over 100 students per year, ________ up to half are from overseas.

A．in which B．for whom

C．with which D．of whom

(2013·江西十所重點中學二模)The businessman wears a suit and a tie with a beard ________ the season.

A．whatever B．wherever

C．whenever D．however

Sarah Brightman, ________ will fly to space in 2015, is the first woman to fly there in the field of music.

A．who B．that

C．which D．whose

Air pollution is getting more and more serious, so we must take action ________ it is too late.

A．before B．after

C．until D．when