According to the passage, what is the effect of Jupiter's other large moons on Europa（） A: They prevent Europa's subsurface waters from freezing B: They prevent tides that could damage Europa's surface C: They produce the very hard layer of ice that characterizes Europa D: They assure that the gravitational pull on Europa is maintained ar a steady level

(      ) carried Europa away in the form of a white bull.

Who are the descendants of Io？ （ ）。 A: Europa B: Cadmus C: Hercules D: Perseus

The objectives of EU?

设二极管的端电压为U，则二极管的电流方程是（ C ）。 A: IS eU B: B. IS eU/UT C: C. IS (eU/UT－1) D: 0

Eu³⁺掺杂发光材料可用于生物荧光探针，因为： A: Eu³⁺是稀土离子 B: Eu³⁺价态稳定 C: Eu³⁺发光光谱受环境影响较大 D: Eu³⁺的发射光谱稳定

下列哪个链接可以查询美国专利（） A: https://www.uspto.gov/trademarks B: https://www.jpo.go.jp/ C: https://euipo.europa.eu/eSearch/ D: https://www3.wipo.int/branddb/en/

EU is short for European Union.

Which country is not a member of the EU?

________ was turned into a bear by the jealousy Hera and finally was made into a constellation by Zeus. A: Io B: Callisto C: Semele D: Europa