Which of the following statements is NOT necessarily true regarding mechanical waves？

Which of the following statements is TRUE?

A．Sound travels faster through cold water than warm water.

B．By transmitting sound waves, the scientists will be able to determine if our planet is warming up.

C．If sea animals are distressed by the sounds, they would swim away from the speaker.

D．There are signs that the animals are being harmed.

Which of the following is not on the list of the countries hardest hit by the huge waves?

A．Indonesia

B．Sri Lanka

C．Malaysia

D．Thailand

Which of the following is not on the list of the countries hardest hit by the huge waves?

A．Indonesia.

B．Sri Lanka.

C．Malaysia.

D．Thailand.

According to the passage, which of the following statements best describes the relationship between secondary atmospheric circulations and jet streams?

A．Jet streams and baroclinic waves tend to interact most intensely with one another in the winter, then act independently in the summer.

B．Jet streams and baroclinic waves tend to exist at various points in the atmosphere in inversely proportional strength.

C．Jet streams and baroclinic waves may behave differently, but they issue from a common source and augment one another.

D．Jet streams tend to distribute kinetic energy in the atmosphere, and baroclinic waves relay this energy back to the jet stream.

E．Jet streams tend to be more affected by the presence of landmasses than do haroclinic waves.

According to the passage, which of the following statements best describes the relationship between secondary atmospheric circulations and jet streams?

A．Jet streams and baroclinic waves tend to interact most intensely with one another in the winter, then act independently in the summer.

B．Jet streams and baroclinic waves tend to exist at various points in the atmosphere in inversely proportional strength.

C．Jet streams and baroclinic waves may behave differently, but they issue from a common source and augment one another.

D．Jet streams tend to distribute kinetic energy in the atmosphere, and baroclinic waves relay this energy back to the jet stream.

E．Jet streams tend to be more affected by the presence of landmasses than do haroclinic waves.

Which of the following statements best describes a laser?

A．A device for stimulating atoms and molecules to emit light.

B．An atom in a high-energy state.

C．A technique for destroying atoms or molecules.

D．An instrument for measuring light waves.

Which of the following is not mentioned as an effect of climate change?

A．It will generate more intense rainstorms.

B．It will generate more intense heat waves.

C．It will affect the growth of economy.

D．It will generate more intense droughts.

Which of the following is true?

A．Phonetics is the study of pronunciation.

B．Phonetics is the scientific study of the movement of sound waves.

C．Phonetics is the scientific study of the sounds of language.

D．Phonetics is the scientific study of the organs of speech.

According to the passage, which of the following is TRUE?

A．The deeper the sea, the stronger the waves.

B．The sea is always calm at a great depth.

C．Huge waves start from the depth of sea.

D．Shallow waters will not be affected by big waves.

According to the passage, which of the following is TRUE?

A．The deeper the sea, the stronger the waves.

B．The sea is always calm at a great depth.

C．Huge waves start from the depth of sea.

D．Shallow waters will not be affected by big waves.