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A．They are active during daylight hoursB．Their heads are exposed to sunlight whil

A. They are active during daylight hours
B. Their heads are exposed to sunlight while they sleep
C. They have only partially adapted to their tropical environment
D. Their wings are easily damaged by ultraviolet radiation

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Look at the four squares [■] that show where the following sentence could be inserted in the passage. One such region is located in the western United States, where recent tectonic and volcanic activity has occurred. Where could the sentence best be added？ Click on a square [■] to insert the sentence in the passage.

A. Square Ａ.
B. Square Ｂ.
C. Square Ｃ.
D. Square Ｄ.

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一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压u_s=1V。求电路谐振频率f₀、品质因数Q、带宽B、谐振时的回路电流I₀和电抗元件上的电压U_L和U_C。

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A．She agrees with the man"s choice.B．She doesn"t recommend the red tie.C

A. She agrees with the man"s choice.
B. She doesn"t recommend the red tie.
C. She doesn"t think the man needs to wear a tie
D. She has no opinion about men"s clothing.

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The word this in the passage refers to

A. oil and coal both have complex molecular structures.
B. all fossil fuels produce carbon dioxide when burned.
C. natural gas releases substantially less carbon dioxide than other fuels.
D. natural gas emits far less nitrogen and sulfur.

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A．They are active during daylight hoursB．Their heads are exposed to sunlight whil

A. They are active during daylight hours B. Their heads are exposed to sunlight while they sleep C. They have only partially adapted to their tropical environment D. Their wings are easily damaged by ultraviolet radiation

一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压us=1V。求电路谐振频率f0、品质因数Q、带宽B、谐振时的回路电流I0和电抗元件上的电压UL和UC。

A．She agrees with the man"s choice.B．She doesn"t recommend the red tie.C

The word this in the passage refers to

A. They are active during daylight hours
B. Their heads are exposed to sunlight while they sleep
C. They have only partially adapted to their tropical environment
D. Their wings are easily damaged by ultraviolet radiation

一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压u_s=1V。求电路谐振频率f₀、品质因数Q、带宽B、谐振时的回路电流I₀和电抗元件上的电压U_L和U_C。