17（）
A: variety
B: invisible
C: abundant
D: forceful
A: variety
B: invisible
C: abundant
D: forceful
举一反三
- What’s a forceful person like? A forceful person is unafraid of ___________________________________.
- He needs to use ____ different skills. A: a variety of B: variety of C: a varieties of D: variety
- For a molecule with a center of symmetry, which is the correct statement about the vibration that has a symmetric relationship with the center of symmetry? A: Infrared invisible, Raman visible; B: Infrared visible, Raman invisible; C: Infrared invisible, Raman invisible; D: Infrared visible, Raman visible
- Hydrogen, which is ______ than off, is pretty easy to produce and does no harm to the environment. A: much energy more abundant source B: an energy source more abundant C: a much more energy abundant source D: a much more abundant energy source
- Themachinelookedlikealarge,old-fashioned_____typewriter. A: forceful B: clumsy C: intense D: tricky