What was scientists' understanding of cryptic species？A．They occurred in equal numbers in

A.what; that

B.that; what

C.what; what

D.that; that

eriments.

A、If

B、All that

C、What

D、If what

（)what many scientists seem to think, measurements and calculations are not the only w

ay to discover truth.

A.ln case of

B.Regardless of

C.ln the event of

D.Despite of

ommunity？

A、if is there any

B、is there any

C、if any

D、if any is

Chinese scientists hve producedn embryo of gint pnd through cloning technology,_____ is brekthrough ______ could sve the endngerednimls.tht; which B．which; tht C．which; wht D．tht; wht

A．that; which

B．which; that

C．which; what

D．that; what

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.

e radon levels of the water build up too.

A. what

B. that

C. which

D. where

A.children learn to speak

B.what children learn to speak

C.children learning to speak

D.how children learn to speak

What does the cancellation of the 16-day flight mean？

A．The scientists on the ground are pursuing only their most important experiments.

B．The shuttle team will be disappointed at the curtailment of the science mission.

C．The science will complete the experiments on a later shuttle flight.

D．The remaining generators are sufficient.