[填空题]Scientists in Alvin were surprised in 1993 because they thought that those giant tube worms would be less than ______ inches at that time.

[单项选择]Why are scientists surprised by the findings in their noise study


A. Because the world is becoming more and more noisy.
B. Because they have learned that noise is also a kind of pollution.
C. Because noise is an unwanted waste for human beings.
D. Because people knew little about noise befor

[单项选择]Because dinosaurs were reptiles, scientists once assumed that, like all reptiles alive today, dinosaurs were coldblooded. The recent discovery of dinosaur fossils in the northern arctic, however, has led a number of researchers to conclude that at least some "dinosaurs might have been warmblooded. These researchers point out that only warm-blooded animals could have withstood the frigid temperature that are characteristic of arctic winters, whereas cold-blooded animal would have frozen to death in the extreme cold.
Which one of the following, if true, weakens the researchers’ argument
A. Today’s reptiles are generally confined to regions of temperate or even tropical climates.
B. The fossils show the arctic dinosaurs to have been substantially smaller than other known species of dinosaurs.
C. The arctic dinosaur fossils were found alongside fossils of plants known for their ability to withstand extremely cold temperatures.
D. The number of fossils found together indicates herds of dinosaurs so large that they would need to migrate to find a continual food supply.
E. (E) Experts on prehistoric climate conditions believe that winter temperatures in the prehistoric northern arctic were not significantly different from what they are today.

[单项选择]Great scientists were so successful because they knew how to learn things outside school by themselves.

[单项选择]The policemen acted quickly because lives were at stake.
A. in despair
B. in danger
C. in misery
D. in pain

[单项选择]Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars (62) continues with the launch of a robot vehicle by UK scientists. It’s part of a project to build an "autonomous robotic scientist" to (43) the Martian surface and is key to the European Space Agency’s 2011 ExoMars (64)
The six-wheeled vehicle housing a myriad of scientific (65) and detectors is the Mars rover, nicknamed "Bridget". Astrium, an EADS company, are (66) the ExoMars rover prototype and coordinating its (67) with other UK-based institutions.
Searching for a (68) similar to that found on Mars, the team took the rover to E1 Teide National Park in Tenerife. Lester Waugh, leading the EADS Astrium team, explains, "The rover’s not waterproof so the conditions need to be dry as any moisture affects the way the sand (69) <
A. skills
B. techniques
C. technologies
D. achievements